Start by working out which of three situations you are in, because they have different routes and different powers.
The three are: somebody confirmed your work but corrected a detail; an employer filed an adverse report about you; or you and the other party to an agreement disagree about what happened.
A witness corrected a detail
You see this on the agreement itself, and you answer accepted or disputed.
They can only have changed one of three things: the delivery date, the value, or the description. They cannot change the deadline, the title or who the parties were. Those are the terms of the agreement, and a third party rewriting the terms after the fact would be a different agreement, not a correction.
They can only have moved it one way. A value can go down or stay. A date can move later or stay.
Neither of your answers changes anything else. Not the recorded facts, not whether the confirmation counts as verified, not your score. Credda tells you that before it shows you the two buttons, and it tells you the same thing about both, so neither one reads as the safe option.
You are told the corrector's role and nothing more: the other party to this agreement, a witness named on this agreement, or the employer on this record. Never a name, an address, an initial or a company.
Disputing is deliberately not a veto. "It really was five thousand" is you asserting a better record on your own word, and asserting a better record on your own word is the one thing this product exists not to do. It is a recorded right of reply, and your record carries both accounts.
An employer filed an adverse report
You see it the moment it is filed, with the employer's reason in their own words. It is not held back from you and you do not have to go looking.
The adverse shift outcomes are late, left early, and did not turn up. An employer cannot record one in a single click: it takes a deliberate second step, it requires them to write a reason, and it is available only on the Business plan. The reason is required precisely so that a missed shift is never left on your record unexplained.
You can contest it. The contest is decided by a fixed set of rules. No human weighs it up, and the employer gets no further say. There are three results.
Upheld, because the report never passed the third party check. It was never independent evidence in the first place.
Upheld, because the report gives no reason. There is nothing for you to answer.
Recorded as unresolved, and stated plainly as that. The record holds one account and one denial and nothing that separates them, so Credda records both and decides neither.
There is deliberately no result that says the employer was right. "The record cannot tell" is never written up as a finding against you.
The honest limit. An upheld contest does not withdraw the outcome from your portable record. The product side reports outcomes to the scoring service and cannot edit or withdraw them, and there is no way to strip an outcome's verified status afterwards. Credda does not report a figure for the effect a contest had on your portable record, because it does not have one. A blank there means not known. It does not mean none, and you should not read it as zero.
A dispute between you and the other party
A dispute on an agreement is resolved from the agreement record itself, by a fixed procedure. The same record always produces the same result. Nobody weighs up which of you sounds more reliable.
Only an upheld dispute reaches your record. Raising one does not.
Things that look like marks and are not
You do not need to do anything about any of these.
A decline. No outcome is recorded, under any decline reason, including "this did not happen".
Silence. Nothing is ever confirmed or recorded automatically.
Recorded, not counted. The work is on your record. It did not clear the bar to count as independent evidence, which is a statement about the confirmation, not about you.
An expired certificate. Not a fault, changes no score.
A Provisional band. An absence of evidence, not evidence of failure.
What Credda will not do
No member of staff can change your score, in either direction. Support can look at an organization and clear it as a real employer, and can help you with your account, but the number is a fixed calculation over the recorded outcomes and there is no manual adjustment anywhere in the system. That is what stops anybody being able to buy or beg a better number, and it is why nobody can be talked into giving you one either.
Credda will not remove a confirmed outcome because you disagree with it. What it will do is record your side of it next to theirs.
If none of the three routes above fits your situation, contact support@credda.io and describe what is wrong.