MTN - Nightmare!!!!!

I have a contract with MTN and since I've joined MTN its has been nothing short of a nightmare!!!! I pay MTN via my cellphone app every month, some payments are allocated and some are not and I have to pay the price for the months that I paid and they were not allocated by MTN, I had the same problem last year September (2017) I had to email them my proof of payment a couple of times before they could sort this out! the same story this year its mid June and I have been calling MTN since February this year and I'm told that I've missed a payment in February I've sent yet another proof of payment today to a guy called: Nhlakanipho Keswa who told me that before I'm re-connected I will have to wait for them to investigate and allocate the money that was paid back in February, he then hanged up on me!!!! so much for being professional! I cant wait until the end of this contract and this MTN nightmare!!!!!