Vodacom customer care does not care

On 18 November 2022 I did an upgrade , I discovered after a day that the phone is faulty it kept restarting on its own randomly. I returned the phone to a Vodashop and they filled in an OBF form since it within 7 days of signing the contract. The phone was sent to Vodacom repairs Umhlanga for an assessment by a technician. After two weeks the phone came back and it was repaired. The phone was an OBF that means they were supposed to do an exchange on confirming the fault not to repair the phone. The phone was sent back to Vodacom Umhlanga. Now I still have not received the phone and Vodacom Umhlanga repairs are playing hide and sick now, they always promise to come back to me and the lady from the shop always gets the say response. What stresses me is that I'm paying for the contract but I don't have the phone. It's been over a month now wasting my time and money. I sent an email to Vodacom customer care on Monday (2 January 2023) no one has contacted me. I want to cancel the contract, I can't be paying for nothing. I won't be upgrading the other existing contracts in the future. The lady at the shop tried to assist, she always call the Umhlanga repairs and not getting a proper answer.