BAD SERVICE!!

Since the lock down started my account has not had enough funds for MTN to debit so I HAVE BEEN PAYING my MTN bill via EFT from my savings account. I have emailed my proof of payments to MTN every month. Which they acknowledge receiving. I have emailed proof of payments about 100 times and yet they have now suspended my account!!!! I have tried to call them on 135 and there is no answer after being on hold for over 58 min!! At one stage a consultant called me, i emailed her all my payments proving the account is up to date and she flat out refused to even open the email and said i should take it up with my bank!! Why ?? My bank has nothing to do with it as all my payments have gone through?? I am totally disgusted in the service i am receiving from MTN in these trying times especially since i have been a good paying client for over 20 years!!