Worst experience and service ever!!

I have had an uncapped data contract with MTN for several years. In the last 2 years it has completely been a nightmare. Firstly they could not replace a faulty router in 12 months, after which I had to buy a new router. Then 6 months ago my charges went over the top to as much as R1,700 being deducted from my bank account on a debit order without any notification or explanation. Now I have to learn via one of their consultants over the phone, in an attempt to renew my contract, that MTN has cancelled all uncapped contracts and are now charging us for the data used per month. It has been impossible to cancel the contract on-line or via their call centers. I had to spend 31 mins waiting on a phone in an MTN shop to eventually get some co-operation and now I will be charged another month for something I have never agreed to. How can these companies get away with this kind of service in the time that we are living in today. I am speechless...............