Bad experience with MTN service provider.

I have received numerous SMS's from MTN that my account is overdue but I have been paying more than I should each month so my account should be in credit with MTN.<br> I have sent all the proof of payments to MTN's customer care on the 5th of January but no feedback or any conclusion has been reached and this is after 13 days.<br> According to me this should be a simple calculation. Funds owed - Funds payed.<br> This all after in the beginning of 2015 MTN Waterfall Mall MTN upgraded the wrong contract as I had an internet stick and a phone contract.<br> I wanted them to cancel the internet stick and upgrade the phone contract.....I ended up paying for 2 phone contracts. Even after speaking to the Area Manager he also could not help me. I just kept my mouth shut and kept on paying.<br> This has now gone too far and I would like to share my experience with other people as I think there are others who also just keep to their own and get bul**** into paying.<br>