Can I have my Paid Up Letter from Nimble Group.

I have paid up my account for Home Choice with Nimble Credit solutions, apparently they didn't notify Home Choice that I paid up last year August. According to Home Choice I still owe them, Until recently I notified Home Choice that I paid up the account and reported Nimble to Ombudsman. It's been back and forth with emails but still Nimble doesn't want to give me the paid Up letter ,so Home Choice can be able to close my account. Even the Ombudsman couldn't help with Nimble. Ntombi from Nimble keep on saying there's discrepancy with Home Choice, lately she says their system went down when she try to send me the Paid Up Letter. Still today no words from Nimble.