infuriated/annoyed

My phone's screen (an experia Z1 compact) went completely blank one day. i had only been using it for a couple of months so no damage was made to the phone.i take it to cell c to find out what arrangements can be made. 1st they tell me to contact Sony because they don't deal with such issues. i contacted Sony and they tell me cell c is responsible for fixing it. so i go back AGAIN, they book it in for repairs. 3 weeks later they call me to come collect my phone, when i got it back, it still wasn't working AND they had damaged it further (speaker was dented). i ask for a replacement because I'm not going to take back a phone that isn't in the same state that i gave them in. they tell me they have to send it to repairs a couple more times before they can 'consider' giving me a new one. i book it in again. i just got it back now and its still not working.they tell me i have to now contact the repair center myself because they can't do anything anymore. so now its on me to spend my time, money and effort to follow up on something that should have been sorted out by cell c themselves. its absolutely ludicrous and I'm quite done with them.