My contract airtime still not credited

On The 21 June 2015 i got my monthly airtime,smses and Data. On the 22 June i tried to make a call and it told me i had insufficient funds, i then checked my balance and it told me i had R0, 0smses and 0MB of data so i called MTN straight away, the man i spoke to then told me what about the 100mb of data i have, i said to him, yes that is what i loaded myself. he then gave me a reference number(***) and told me i will get a full refund during the week. Its now 2 months later and i haven't heard a word. From last month instead of my contract being R299 it is now R309, not that its a lot of money but the point is that they never informed me of this price hike and i think that is just disgusting, even an sms would of been fine but nothing! I have wasted thousands of R in airtime and data because when i load any airtime or data it gets taken immediately from my phone, all my apps are set to use WIFI only and i just use whats app which DOES NOT take that much airtime or data!! MTN used to be one of the best service providers around but i am definitely phoning to cancel my contract WHEN your systems are ever back online!!!