No signal and paying for contract that I can't use at all

(Second time I complain now on HalloPeter about my vodacom contract) After more than 2 months with almost no signal in my office at work, (emergency calls only/no network) and I had perfectly signal for 8 years now in my office. I called more than 9times vodacom and there network department to resolve the problem, eventually 18 days ago they send a technician to come and see wat is going on. He told me vodacom and himself will give me feedback in a week time with a solution and he took all my details, after 18 days now, nobody called me back, I try to call the technician on 3 different days, as I do have his number and he does have my number and email address, but he doesn't pick up at all. I try to stop my data contract that I paying now for 2 months that I can't use at all in my office, vodacom told me they can't stop my data contract...