ABSOLUTELY NO FEEDBACK

I had given my Blackberry Q10 in for repairs, it was rebooting all the time, given in on the 18th Feb. I spoke to Zitha who checked phone, booked it in and advised that should fault be due to my negligence, MTN would charge me R330 to repair, phone was still under warranty in any event. Monday, Tuesday, Wed, nothing from MTN despite several emails to Zitha. I receive an sms from MTN on Wed night advising that repairs will cost R649, should I opt not to repair, I would have to pay R330!!! I tried calling so many times I lost count!! no one answers, I needed to talk to someone to check on what repairs need to be done!! I am so frustrated, this is like calling into a government office!! to date, I have heard nothing from Zitha nor the repairs, oh except their sms asking for money to repair!! what repairs do they want to do, I still have no idea! I also have a problem with my current upgrade which Zitha did. I received my anytime minutes, no sms's , data! been a week now, several emails to Zitha, still nothing been done! I would just like to cancel everything I have with MTN, such a waste of my time and money!!