MTN not able to understand how to allocate payments made

I have paid my MTN monthly subscription fee for June 2018 on the 04th of June 2018 I then paid my subscription fee for July 2018 on the 30 of June 2018. Because I have not Paid in the month of July, MTN cannot comprehend that I have paid one day early and therefore my payment does not reflect in July. I then received numerous sms's regarding July pmts. I have forwarded proof of payments several times and my service was suspended a few times. I have received several sms's saying that he matter was resolved and my service as reinstated I paid my subscription for August on the 01st of August. I then paid another fee on the 13th August after receiving yet another few sms's that I have not paid for July. I then paid another fee on the 13/08/18. Paid September fee on the 05 th September. Paid October fee on 01/10/18 Paid November fee on 01/11/18 Received a sms saying my account is in arrears. Contacted MTN Customer care via e-mail and sent 20 replies and proof of payments. I received a reply that all my payments are captured yet my service was suspended on Monday 19th November. I havepaid atotal of 7 payments in 6 months which I simply cannot get anyone to understand. The problem lies in that I have paid my July fee one day earlier on the 30th June!