Bad awful serves

I had a account with fin choice that was handed over to nimble group,I paid the account in full in 5 May 2023.the account still reflect in my credit report and it shows active and in errors they are not submitting my paid up letters to credit bureaus.I have written them emails numerios times and they only tell me the account is not with them.How come while it reflect in arrears under my credit report. I cant even open persona loans because under my name the is this FINCHOICE account in errors under my name that is already paid up full in 5 May2023