I WANT MY PHONE BACK

My Sony Xperia V stopped charging and I handed it to MTN Sandton for repairs on 24/2/2015. I was promised I would have the phone back in 14 working days. From the date I handed the phone to MTN I received no correspondence. After about 2 weeks I went back to MTN and they could only tell me that the phone had gone to the repair center and that I would receive an sms with more details. No sms till today. I tried to call the call center and the line is always busy. I then sent an email to hvrc and I started getting answers. They told me the phone had been assessed and that I should pay R 1206.70 for the repairs. The phone is still under warranty. The reason given for voiding warranty is ridiculous as I treated my Sony very well. I rejected the quote and requested to have my phone returned to me so I can hand it to my insurance for the repairs. I sent another email to hvrc requesting my phone to be returned and they told me that I have to pay a R330 service fee before I can get my phone back. I have not received any service and the T&C's state that a quote rejection fee applies to out of warranty devices. My insurance wants to collect the phone for repairs. MTN I want my phone back.