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Unfortunately, the creditor has 6 months to update information on the account. However, you CAN dispute that the account is paid in full, marking both last payment received and account balance as being incorrect. You can include your letter stating that it was paid in full as supporting documentation. It will either be updated or removed within 30 days with the dispute.
Resolution of any dispute of the accuracy of reporting can be resolved by correction of the asserted inaccuracy.
Deletion is only mandated if the information cannot be verified or corrected.
Additionally, if the dispute relates to the balance, then verification/correction/deletion would only apply to that information, not the entire account or derogs reported under the account.
In the case of the current balance, deletion would not be mandated. An account must have a currrent balance.
In resolving a dispute, if the creditor fails to verify or correct, it would fall to the CRA to make that determination.
They have the power to update the balance to $0 per the assertion in the dispute without any requirment to delete other accurate reporting.
If the creditor fails to make what you consider to be a required update within a reasonable time, then you can file a formal complaint with the CFPB.