Cell phone claim

Hi I have a contract with MTN for the past 8 years I recently received a call from a call Center agent who sold me a contract for a new phone when I received the phone it was not to my liking so I returned the phone the very day and cancelled the contract I was then being charged for a phone I returned after few months I was back in the Clearwater store and we tried to sort out the issue which was resolved after 3months I then took out another contract ad 2months down the line my line was suspended due to none payment which I was not notified about and did not get any message or mail or a call from MTN stating there was no payment I then went instore again only to find out the guy that took out my new contact cancelled my debit order and I was not aware of I am now handed over to there lagal team when I spoke to the manager of the store he promised to get back to me but never did I recently when to the store to find out what's happening he says he does not know anything that's happening to me account which I believe is not true or he does not know his job title I now do not have a phone line which effects my life cause I am a independent contractor and relying on my phone to contact customers which I haven't being do for the past month now and the manager rufuse to take responsibility for his staff and admit to there wrong doing.