Upgrade Cancellation

OK on Monday the 9th Oct 2017 i received a call from one of Mtn upgrade department staff. We discussed a possible upgrade and i agreed to the price of R489 monthly for my upgrade. On thursday 12th Oct i get an email with the invoice which read the contract was a duration of 3 years now, which i wasnt informed of prior. So i phoned mtn customer service the next day, friday the 13th and Jerry the consultant advised me that my problem would be rectified within 72 hours and he would send me feedback. On monday the 16th i phoned customer services again to find out feedback as i was ******* into taking a 3 year contract which wasnt right to my liking and Norma gave me a landline number to phone with my own airtime. I held switchboard for a good 15 minutes and didnt get through, so i hung up. Wednesday today i phoned again and explained my scenario to a lady Nqobile . She put me through to another department, cancellations as i now wanted to cancel the whole contract and have nothing to do with mtn. The guy that had my case kept making me hold the line and eventually told me he is taking up the matter with his supervisor and will phone me back in 5 minutes. Till now i havent received a call from anyone. I am done with mtn and the poor customer service your operators have. Even the lady which misled me to taking the 3 year contract which i have never heard of. I have been very loyal customer but if this is what your service has come to, im sure i can find another operator who will put my needs first.