How to cheat a customer

On Monday I upgraded my device to a Samsung Note 5 and with it the contract. Tuesday after my SIM activation I set up the phone and during the day I experienced 5 - 6 random restarts. On Wednesday to make sure it is not software related I reset the phone to the factory settings but the phone kept doing the random restarts, 3-4 times. Thursday I took the phone to the store explained the issue. Store manager promised he will take it the same day to be checked out to confirm a replacement because I'm leaving Saturday for a 3 week Business trip overseas. Friday I called the store twice, I was told the manger will call me back. Nobody called me back so I went to the store, where again I was told to come back on Saturday because Head office is closed but it will be open on Saturday. Saturday at the store I was told Head office is closed Saturday's and they can't help me. Now I'm spending time writing on HelloPeter and talking to a my lawyer instead with my family before I leave for a 3 weeks business trip. Dear Vodacom I want my contract restored to previous state, I don't want the upgrade anymore. Until my old contract state is restored all debit orders from Vodacom will be blocked.