Student loan — Northland Group Inc (SC)

Having problems with customer service. I received a letter from Northland Group Inc., dated XXXX XXXX, 2016, demanding payment on a loan assigned to them by XXXX for collection of {$23000.00}. However, the same loan was previously assigned to XXXX XXXX XXXX, which agreed to cease and desist on this account, via attached letter dated XXXX XXXX, 2016, since apparently, they could not verify the loan as being mine. I do n't understand why XXXX has reassigned the loan to Northland despite the previous collection agency not being able to disprove my claim that I do not owe this loan. I have not borrowed money from XXXX XXXX XXXX services and thus request CFPB to please compel XXXX and Northland to desist collection on this account from me.