Still waiting for a responce

So MTN phones me and promise me that they will phone me back and give me feedback and if they are going to do something to my signal problem. I had 3 years ago a 3G area and now they say I have only 2g but is also fine. The thing that bothers me the past few months maybe a year I can not receive or make calls at my house inside and out it does not matter. This is going so far that I had to call people over 20 times just to be able to hear them. And the chances of them phoning me back and I have signal is almost 0. MTN promises me every time i phoned them that they will phone me back the same day on telling me what they are going to do etc but they never do. I do not know how a company like this can give so poor service and be so full of empty promises.