I was misled by one of your consultants

My contract with MTN ended on the 11th of August 2015 . On the 6th of August I received a call from an MTN sales consultant offering me a new package . I was on R186 and he offered me R19 airtime and 25 smses . I agreed . he never mentioned the word upgrade and he told me that at the end of August i will only pay R19 . I was charged R186.00 at the end of August and when i called the call centre they say R93 is an upgrade fee .I didn't even know that i was doing an upgrade .. I called 808 and I was referred to retentions because i wanted to cancel the contract since I dont know if they'll stick to R19 again this month. I called retentions and i was referred back to 808 and finally Lewis from 808 decided to send a request to cancellations ref *** on Monday the 14th of Sept . I'm still waiting for feedback . The upgrade fee should be reversed and I dont want the contract anymore and would like to change to prepaid . Please assist .