CONFIRMATION LETTER THAT LINKS THESE TWO REFEFENCES

FINCHOICE doesn't want to assist me with my request below, IGNORING MY EMAILS AND OFFERING NO ASSISTANCE OVER THE TELEPHONE. I have settled my account reference no. ***3, only to find out that initially the reference for the very same account was *** before it was handed over to debt collectors. So I need proof of linking these references TO ONE ACCOUNT. My request was for the confirmation letter for the two references or accounts for the same loan or account. So, please confirm in writing that these account numbers, Ref. no. ***3 and Ref. no. ***, are the same or one account, and please let me know the reasons for that in a letter. Can you assist me urgently?