Bad Service

On the 14/07/2015 I took a contract phone @ mtn standard bank centre in Pretoria central, the contract was for R229.00 a month. By the 15th July they didn't debit me and by the 15th of Aug the took R1552.00 and when I enquiry with MTN was took I have an open-line where as I took a top-up. They promise to investigate and said they will get back me after 15 days but they didn't get back to me till I call to enquiry and only to be told my case was closed. Case no***. I ask how much they will debit me on the 15th of Oct and they said to me they'll now debit R229.00 but to my surprise the took R794.00 and when I called MTN I was told to go to the branch where I took a contract. The manager there John and his consultant Rosina are so pathetic coz they don't even know what to do coz the also call the same no: 808 to verify what's happening. Now I have another case no again USD***. I need this matter to be resolve and also be refunded my money because every month I buy one gig of data and also buy air time. There is no internet or free air time I am getting form MTN. I don't think I'll ever refer anyone to MTN and really can't wait for this contract to expiry. Pity its still new