False contract with dubious MTN provider

I have been an MTN customer for 20 years and have been on contract with them. In November bought a new cellphone at an MTN store and was told that my contract would need to be upgraded in February. I was told that someone had contacted me to tell me about an upgrade but I said this had not happened. I was then told that someone would contact me. I told the store that I wanted to stay on the same contract as I had been on - namely MyCall 200. I was then sent a new Sim card but the person on the phone said I would be sent a contract - this was never delivered. In December for the first time ever in my 20 year contract, I ran out of airtime and data - which has never happened before and my use of the phone had not changed. At 3am on 25 December, in the middle of a burglary at my home, I did not have airtime to call the police and had to try and buy air time and data. I ran out of data and airtime again in early January and went in to 3 different MTN stores and was told to contact 3 different numbers of MTN subsidiaries as they said my contract had been outsourced to a subsidiary - none of the numbers were correct and were private individual's homes. I phoned MTN in January and explained that I had never asked or agreed to be put on a different contract and asked to have my prior contract resumed. I also said that my contract was with MTN, not some ***** subsidiary, who clearly was not giving me the airtime and data and I had requested. I was told by the call centre operator that my contract would revert to the previous package. Clearly this did not happen. Once again, I have run out of data and airtime and nothing has been done to revert my contract to the previous contract where I never had problems running out of airtime and data. The complete lack of customer service and support, the palming me off on a dubious subsidiary of MTN and broken promises are unacceptable.