Poor service at MTN Northgate

Hello I would like to leave a review for MTN Northgate. On the 6th of May I went to open a laptop/router contract and I have been assisted by a guy called Lufhuno. He told me they can't approve my contract because of discrepancy wich he could not tell me what it was. I was advised that they will sort it out and give me a call. I waited for the whole week and all the time I called in they had no answers. I went on the 13th May to follow up it was around 17:00 and the manager assisted and got approved but the one I was buying on the catalog was R699 but they said on the screen it says R789 but I must not worry about it they will log a ticket and fix it. Since then MTN has been debiting R789 from my account and when I query it they say they are logging a ticket to get it resolved. Month end July I went to the shop to query and Mr Dlamini told me that he will personally deal with it (I think he is the manager) He said he will log a ticket on Monday (it was Sunday when I went to the shop) On Monday he calls me and told me that the ticket has been logged he will follow up and keep me updated until today I have not heard anything Now I just received a call MTN is trying to sell me something else. how do I buy if you can't service your clients? I told the lady on the phone my experience and she checks on the system and she tells me that again this month end I am going to pay R789. MTN I AM BRINGING BACK YOUR LAPTOP AND ROUTER YOU MUST CANCEL MY CONTRACT WITHOUT ANY TERMINATION FEE AND IT SHOULD NOT ***** MY CREDIT SCORE!