NO response Poor service from MTN

My phone was booked in with the speaker and the network problem. <br> It was fixed under warranty, when the phone was returned back to me on the 28/04/2015, I tested it immediately while the courier guys was still there then I send it back with him. On the 19 of May 2015 I was told that phone has been declared as BER (SMPHP***), The next day they sent me a letter to go and get the phone from MTN, I was told that I need to pay R750 access, I queried about that and never go any response till today from the 19th of May, I decided to go and pay that R750 so that I have phone as I needed it for work. It was fixed under warranty initially when I book it in, it was never mentioned that there is a liquid damage. When it was returned to me I tested it immediately with a Courier guy next to me and gave it back to him immediately after realising that it is not working. I need my refund for that R750 I payed, two I also mentioned on the email that I still have their loan phone they must arrange for collection, but still no response. My matter was escalated to so called supervisor (Koketso Mathabathe) who is very helpless, <br> <br> Please contact me on *** [Email Removed]