Vodacom Service

I have been with Vodacom since its inception as a business and would like to say that their service has never been great. Now the final straw! I signed a new contract with Vodacom in Gardens, Cape Town on 2020/01/06. I received a Samsung Notebook 10 which is costing me R600 odd per month. Oh 24th February the phone broke. I had to return it to Samsung in the Waterfront. After much arguing on my part I eventually got them to agree to repair the phone at no cost. Initially they want me to pay! Now after a whole month of not having the phone the company wants to charge me rental on this phone!!! Everyone is passing the buck to the other department. When I phoned accounts - which I was told to by the franchisee - the woman on the phone wouldn't give me the name of their manager or her own name. Where do I go from here? Please assist a desperate customer who is getting no/very little customer service.