QUOTED &OVERCHARGED new customers more important

I contacted mtn to enquire about migration from my existing contract to the sky package.<br> after speaking to 2 unhelpful people I got through to a Johan who assisted perfectly and informed me that I would only have to pay R1499 + cli and itemised billing based on this I agreed , call was on the 16th Feb 2015.<br> end of Mar & APR MTN took R2170 from my account charging me R1799 + my device promo fee from my existing contract...but they charge R1799 with a device as per their website??!!<br> Johan mailed me after I spoke to more then 1 person trying to get help and said he sent the query to billing to sort out , since then I have spoken to so many people in vain, today I spoke to a Riedwaan who says will get the recording and even if I am telling the truth they will still not be able to give me this rate till the end of my contract in Nov, I have previously requested the voice recording but he called to say he couldn't find the recording.i sent proof of mails. <br> if MTN cannot honour the price I was quoted then I can rather move to another service provider.<br> 2 months now I have been overcharged almost R700 , and still nothing sorted out , now told the pricing is for new customers and not me!???