Over Billing with no proper communication

I am disappointed with the service I received from dstv. I had a 24 month pricelock contract which I was send a message that it has ended, I contacted dstv to enquire about an increase on the amount stated on the statement. I spoke to Mbali on the 1st and said there was an error on the bill will escalate it to billing department, said it takes about 24-48 hours for feedback. Day 4, no feedback when I checked in. Today marks day 7 still the error has not been corrected. The only thing I am told is I am left of with a month for my contract to end, my question to them I hear that I am left with a month but why am I paying more than what I should be paying, mind you I have been paying R1117 now the is R 1391.No body seems to know how it got there, when I insist they say they will escalate the error on my bill to the billing department. QOLI is the agent I communicated with today he/she said I'm left with a month, when I probed him with more questions he/she said my contracted has ended, now I am left even confused.. QOLI decided to cut our chat short. I need clarity on this matter asap now I want to either downgrade or cancel the premium subscription. I need an urgent intervention, no Ref number was provided on both accounts