Finchoice and Nimble group with low customer service

I lament the day I turned to FinChoice's collection department for assistance, as it was to no avail. Despite settling my account in August 2022, FinChoice transferred it to the Nimble Group. Consequently, my credit has been negatively impacted due to Nimble's report of four months of missed payments on my credit profile. They have failed to instruct Experian to amend the payment profile, even though the account was closed in August 2022. Nimble has erroneously recorded me as missing payments from November to February. My attempts to rectify this through emails have been met with no support from either entity.