Faulty Device

I have been struggling with Vodacom to get my device replaced over 4 months now. Device was sent in for repairs 3 times. The store makes excuses and find fault with a different object everytime. First it was the cable, then the adapter. Device is still not charging and the store does not want to send device in for repairs again. Online support ( Vodacom on messenger) is not very helpful as they keep on referring me back to the store.