Breech of contract

Hello I'm hoping somebody on this group can help me. Vodacom is the worst company to deal with when they the problem. I did an upgrade of a phone the phone over heated from the very 1st day they sent the phone away as a OBF (out of box failure) which we you get your phone then they tell you if you have problems with the phone in the 1st 7 days then they replace your phone with a new one. Then my phone got sent to JHB and they returned the phone by saying nothing wrong with the phone however all the technicians at canal walk say the phone is over heating. Then took my phone and the same thing still happening and phone is over heating took the phn back was sent to JHB got sent back once again saying nothing wrong it's more than than a month I still don't have my phone or a replacement but I'm paying for a upgraded phone.

And to top it we sitting with a bill dispute of our router paid it but cannot use it as they blocked it. Vodacom is the worst network company to deal with I have been running back and forth but still no answers.