CONTRACT CANCELLATION

My query remains unresolved. Contract phone was delivered by Sell Direct on the 8th Jan 2016, the phone is still not working. Same day the 8th I then took it to a Telkom store in Pavillion, Durban. The manager-Vernon and a technician had a look at it, it does not even switch on. The manager suggested they book it in for repairs again (I only used the phone for three days since the upgrade and after that it was taken for repairs). I can't pay for a phone only to sit with repairs whilst I'm in need of a phone. Telkom mobile has failed me, they have not kept their side of the deal. The involvement of a third party (Sell Direct) has resulted in Telkom ceding responsibility and accountability forgetting that my contract is with them not with Sell Direct. Because of these issues I want to cancel my contract upgrade-cellphone is packed and ready for courier collection. I will not be liable for any penalties simply because Telkom mobile is in breach of our contract. I sent the very same email to Vernon(Pavillion Manager)-with the intention to cancel my contract as he could not help me. He acknowledged receiving the email and promised to forward it to the relevant people.