Bad Bad service and unkept promises

I took out a contract on BB Z3 during May 2015. During October 2015 I noticed that the device had NO sound I could not HEAR incoming calls notifications etc. After MANY visits to various Cell C branches and even an appointment with the Cell C rep which she DID NOT keep I was assisted by Cell C Cleary Park who booked my phone in for repairs on 16/11/2015. I received it back a month later I noticed on job card that they upgraded the software and replaced the USB/Daughterboard. On 26/1/2016 after having my phone on \silent\" in a meeting I noticed when I turned it back to \"normal\" NO SOUND on device AGAIN!! On 30/1/2016 I saw a technician at Cell C direct branch Cape Road PE who adviced me to wait for a consultant to book in my phone and he advised me that they will have to request a NEW device as this problem will keep on recurring. On this day I could not see an consultant and returned to the branch on 5/2/2016. My phone was then again booked in and a NEW phone requested by consultant. On 19/2/2016 I then collected my \"NEW\" phone. When I got home I noticed a sticker on the bottom of the phone \"REFURBISHED\" which is a clear indication it is NOT a NEW phone. This phone overheats when i"