Putrid Service

I have been struggling with my internet connection for more than half of 2017 and still have an intermittent connection. I had 2 months without internet at one point. Whenever I called the agent reset my port, recreated my port, give me different stories. I had 4 technicians at my house already, each with a different story. If it's not the overhead cable, then it's the underground cable or fault at the exchange. The last technician that was here fixed the problem, albeit only for about 2 or 3 weeks. I now logged a fault on the 28th December 2017 (426CWK281217) and it's now 6 days later and still no joy. I am past frustrated already. I demand an LTE router and uncapped connection for the same price i'm paying now or I want to cancel my contract.