Empty promises and terrible service

I received a mail advising me that my fibre has been upgraded from 20MB to 40MB. On an ordinary day i do not even catch 12MB. This problem has been ongoing for months now. the technician came out once and had to re-install the line. 3 months later same problem. Now they refuse to come out threatening me that they will charge if the problem is not on their side, I agreed to that, they have to prove the problem is by me. Yet they closed the call the next day without anyone coming out or resolving the issue. Is this the service we are forced to pay for because I can get much better service at a lesser price else where. Please cancel my contract if you cannot provide me with the service I am paying for. I took it out in good faith, I truly regret my decision.