MTN service is the worst

MTN is the worst network service provider, I have a Wi-Fi contract with them they debit my account every month with no problems they have never tried to debit and not find money on my account until last month when they decided to change the debit date to the 17th without informing me. I have called to ask them to fix this and they told me its not changed on the system my account is debited on the 25th I even received a new debit check mandate that I did accept. Come 25th June my account is not debited on the 26th I receive email saying I failed to honour my agreement of paying the instalment amount I must go and pay at the store or my WIFI will be disconnected I called them again they said the new debit check was done on the 20th of June so my account will be debited next month I must go to the shop and pay or do EFT which will reflect after 3 days. I asked if I go to the shops when will it reflect they said immediately I went to the shop and paid. this morning I wake up to the email saying you failed to honour your agreement to pay on the 26/06 your service will be cancelled and my Wi-Fi is not working meaning they have stopped it. I called MTN again I spoke to three people and they told me my account is suspended on what grounds I do not know the third person was in the collection department she asked me if I paid yesterday and asked me the name of the shop and put me on hold until the phone dropped. all the time I call I receive an email saying service request open service request completed but all the time I have to explain whet the matter is they cant open my profile and see what is going on this is not my fault its their fault that they do not debit on the correct date worse part I did pay but they disconnected me.