Unhelpful

My homechoice has been in arrears for a long time because of financial difficulties.I got money an started paying my accounts my home choice account was handed to Norman bissiette an associates I emailed and asked if I can pay my accounts in full at a settlement discount I was informed homechoice took account back so I went on home choice account an paid the R1995.93c got a payment completed notification an it came out my bank account. Then I tried to get a paid up letter I got the most unhelpful response they don't have my account they handed me over to another 3rd party MBD they called me I explained an they gave me a email it's one month later and nobody can help me I need this 1 paid up letter to clear my name I feel like I am in hell,homechoice is making like they don't see payment yet I have proof of payment and MBD just ignores me. I want the number of the Manager or someone in senior position because this is ridiculous. I paid it's not like I didn't