Still no feedback from service provider

Last week I complained about the very poor service I received at telkom cresta regarding a phone that had been in for repairs for over 3 weeks (when I was told it would take maximum 2 weeks) ,telkom responded by saying that the branch would be in contact to resolve yet that has not happened. So I then visited the branch to find out what was going on, again I was very disappointed by a man who assisted me named David took my details down and said that he would contact me by end of day with feedback, needless to say that never happened. I think it is appalling how little care telkom has for thier customers. I have not had a phone for over a month now all because of a manufacturer fault yet I am still expect to pay for it every month. I would not recommend it to anyone at this point would really like for them to keep the phone and cancel the contract. I have made 5 trips to that store numerous phone calls and no one is willing to assist. Absolutely disgusting way of the treating your customers.