Cool Ideas Failure to Deliver

I have been paying for a 50mbps line up and down for 7 months now. We do not go through one week where the WiFi does not stop working for hours at a time, and/or the speed will be so slow we cannot even send WhatsApp messages or load voice notes on WhatsApp. I have emailed the support team multiple times, and although they have 'solutions' they never seem to last more than a day or two. Now they want me to pay an ADDITIONAL amount for them to investigate and access the problem? But it is perfectly acceptable that they have been taking my money for 7 months but have not been delivering the service promised? And now, we are tied into a year long contract so if I want to cancel my contract I also have to pay an additional fee!