The number does not exist, yet I have to pay monthly rental.

A phone which was delivered in 2019 October the 17th was only activated 25 Jan 2020 at 15h45. When I thought the problem has gone, its even more stressful as the line does not exist when I am being called, only I can make calls. Then if that is the case why do I pay a monthly rental on a service which no one can reach me on it. I have been cal;ling them, first week of February I was told that it is a problem which everyone is experiencing and will be resolved, again on the 14th February I am told that they will resolve it. Furthermore I am charged for a rental service which I am not having or using. I am done with telkom and I want nothing to do with any of their product.