Pathetic call center and Service

I recently upgraded my Mtn contract on 16 October 2017 and agreed to a R389 per month, I am now being debited a total amount of R649 pm, after holding on for 2 hours summer mobile eventually answered I then requested my recording when I took the contract out sold to me by Yumna Putis, Connie a call center agent answered and then reviewed the recording which clearly shows that I agreed to a debit of R389, summer mobile has not answered any of my calls since they given me a ********** 474 of a Manager called Ashley who never answers his phone, they now pushing me from department to department to resolve this when summer mobile called me to take this contract out they even have proof of recording that's states so, I have wasted my entire months minutes and have topped up twice since then and they still have not taken my calls, this is not what I agreed to contractually and now summer mobile is hiding behind red tape and blaming Mtn billing department for their stuff up.