VODAVOM DEVICES HAVE MENUFACTURING FAULTS

I recently reviewed my cellphone contract and within 2 days the phone was returned to the New market Vodashop for assistance, they confirm that the phone was faulty as th October it could not make outgoing calls, this was on the 27th October and till today vodacom is sending me from pillar to post instead of replacing the device...their call centre agents are always telling me that the query is send to the "backroom" or "backoffice" which i find very unprofessional. the last consultant i spoke to "samalina" advised the query will be resolved in 72 hours as the device was with one of their stores. i called in again today and spoke Itumeleng and she said there was nothing reported and the only advise she kept on mentioning was to cancel the contract. im sooooo disappointed with the service i've bn received because they end up even disconnecting my calls cos i asked to speak to a manager or team leader. I WILL NEVER DO BUSINESS WITH THEM AND WILL ENCOURANGE ALL MY FAMILY MEMEBER TO CANCEL THEIRS. THEY HAVE THE WORST SERVICE EVER!!!!!!!!!!!!!!!!!!!!!!!!!!