PAID UP LETTER REFUSAL

I had an outstanding account with MTN which was handed over to Hammond pole attorneys, I paid the outstanding amount to HP and sent them proof immediately. I then requested for a letter stating that the account has been paid up (Funds were paid on 09 July 2019) my bond registration is on hold until that letter has been issued- it was been 1 week and MTN still hasn't changed the status of my account with them from legal to paid up, I call in almost everyday requesting an update to be told the same- they haven't received any confirmation and that they need a letter from the attorneys but I am told that the attorneys require a letter from MTN. Both MTN and Hammond pole have no idea how to provide correct information or proper customer service . I then sent the proof of payment to MTN hoping they can issue me with a letter to be told that HAMMOND POLE needs to provide the paid up letter. It is totally unprofessional that even after clients settle their arrears they are still left on ITC and no letter is received as promised. WORST experience from MTN in my entire life and I have always had my contract with them. please can someone assist me in getting this letter because I am dealing with *********** people who keep sending me from pillar to post whilst my bond registration is being affected.