Signal so bad that Vodacom staff keep on buck who to fix

For nearly a year now our company struggling to get Vodacom to do something about the poor signal in our area. I logged the complaint on the 21st of January 2017 but till now its not sorted. Everytime i call the call center there is another story and passing the buck to the next department. After a few months of swearing eventually a person came out to our premises to test the signal strength, which upon arrival the lady said that it is very bad and that she will report back to Vodacom to do something quickly. She mentioned something about a signal booster and there is something else as well apparently they can do but till now since the visit nothing is done. I called a couple of times afterwards to find out what is happening but either the call get dropped or just no results can be provided. The one agent mentioned that it is Solutions Department that need to do something about the situation and another agent mentioned Wayne who is with the network team. I have spoken to Dikaledi (if this is correctly spelled) at some point with also no results. our company has over 200 lines, if we cant get this matter sorted then it will be forcing my had to port all my numbers to another service provider who is willing to solve the issue.