Disgusting service and 5 weeks (paying) waiting time

5 weeks ago (20 July) I gave my Sony phone in at Eikestad Mall MTN in Stellenbosch for a quotation to fix my cracked screen. After being told I would receive a quote by the following Wednesday, I called them a week ago (18 August) to ask what's going on since I hadn't heard anything yet. I was then told that the person who checked my phone in would follow up with the Sony repair centre and call me back. I never got a call back. Thursday (24 August) I went to them and explained what had happened. I then was "helped" by being given the number for the Sony repair centre. When I called them the following day, they told me they sent my phone to another company to be fixed. This company gave me a quote, which I rejected. I was then told I would have to pay R600+ to get my phone back, after I signed a document at MTN which stated the quote rejection fee is R330. After multiple calls to Sony and MTN, I was told that MTN hadn't informed me correctly about the amount it would cost to get my phone back. Sony also said that they only received my phone 18 August - FOUR WEEKS after I gave it in at MTN - and meanwhile I am paying MTN for my contract. I have also never been treated so badly as the way I was the day I gave in my phone. The lady initially helping me showed my phone to her co-worker, laughed and said it would cost the price of a new phone. Sony agreed to send my phone directly to me, but I still have to pay more than R330. The MTN head office told me that I need to go in store, get the manager and then call them back in order to lay a complaint. I have no interest in going back there, since I do not feel like being treated like that again.