Once again no signal or data coverage

Its now almost been 6 months since I reported signal problems on facebook. The first week after my complaint a consultant phoned me and said they are investigating the problem. Up until today nothing was done. It takes approx. 2 minutes for google to open, then I havent even start to search. Sometimes my whats app is down due to no connectivity. When I sometimes phone someone, I cant hear them and then I end up phoning them more than once just to talk to them! I work from home and need the internet to do my business. Can someone please check into this and fix the problem? Or come and put up a booster or something? Please????