Vodacom ****med me

I recently took out a contract at Vodacom via what they call online department, the phone was delivered, 7days later, received a call from the agent who sold me the contract, a courtesy call that was, at that time,there were no problems with the device, three weeks later, the phone just went off and didn't charge, I have been using the original charger as stated, the device just couldn't charge, I took it to Vodacom repairs in Canal walk,they took the phone and said they will have it repaired in two to three days, that didnt happen, instead, I was contacted, told that it's a manufacturer issue, the phone will take longer to repair, ts been now two weeks, I called Vodacom and asked why couldnt they give me a new device, the phone had a manufacturer problem, not my fault, was told about 7 to 14 days period which seemingly lapsed, now I must keep a repaired phone for the next 23 months, how unfair, when I argued this case, I was told that the phone has already been tampered with, question was, bu who? I took the phone to Vodacom, no one else, if it has been tampered with, it is Vodacom, still no luck, I just visited the store, my repaired phone is still with Vodacom, im very angry, the level of service is pathetic, Vodacom doesn't care and wish to lodge a complaint with ombudsmen