MTN is ******

I had a data contract with a router. I had the contract longer than the contract time and wanted to find out why I am still paying for the router since it has been paid off. the person said that they will not change my amount I will just pay that amount and that is that. very rude. then starting the new month I did not get my data and had problems with connecting to the internet. I called multiple times to find out what is the problem and went to the MTN shop in bonaero and they just advised me that it was a mistake on their side the data will be on within 48 hours. It went on like this for weeks and the data was never loaded. then its a technical issue then this then that. I then went to the shop wanting to cancel the contract saying that the months data was never loaded so I want to cancel it immediately without paying for the month, since the contract was broken on MTN side with not supplying the data. they then advised me that I should rather convert the contract to a prepaid then I would not pay any more money. Now MTN has handed me over and wants to blacklist me for not paying equivalent of 3 months!!!! How ridiculous is it that!