Service Complaint

I went to the mtn store at Mall Of Africa to pay my account on the 1st of August 2018, I paid double the amount I was owing, few days later my line was closed saying my account is overdue wherelse i paid for the following month , i managed to call them twice to explain my situation and 2 ladies by the name of Luyanda Cebekhulu and Duduzile Khumalo from mtn contract customer care asked me to email my proof of payment which I did and both did nothing about it until I had to call the 3rd lady who helped open my line then few days later I went to the same store i paid at they told me they will rectify it but to my surprise my line was closed again I had to go back to the store a few days later and tell them , now I can’t stop receiving sms’s that I owe mtn where else i paid them so they are really ***********