Struggling to get a paid up letter

I'm struggling to get the correct paid letter from Finchoice. Afeeza the Finchoice Consultant, who's rather reluctant to assist me. Keeps on sending me paid up letter with the incorrect information and account number. My credit profile is affected by this. Account was settled in 2020 already. Now one of the credit bureau is waiting for me to send them a paid up letter from Finchoice, with the correct account number. Or at least explain on the letter why account was transferred from one to the other.