I WANT OUT

I upgraded my contract in March but had to return my device in July due to it being faulty. It was sent for a warranty assessment and after 2 weeks when I phoned to follow up my phone was not booked in on the system yet. On 13.08.2015 I was informed that the assessment was approved and that I could get a new phone. Upon my arrival at the store I was told that the TAB 4 was discontinued and I could only take a TAB 3 on my current package. I took the TAB 3 but had to rerurn it one day later due to it being faulty. When I asked if I could take any other phone accept a TAB I was told NO because I am on a data line and not a voice line. I want to cancel my contract because I am totally not willing to take another TABLET from MTN. I am a loyal customer and I have been paying my account without hassle but I refuse to pay for a phone that I have to wait for 5hrs for it to unfreeze before I can use it.