Shocking non existent service

Absolutely awful. Took out a contract nearly 2 years ago. Price increased after a year fine. However for the last few months I have been trying to get the wifi I am paying for. Basically the wifi is non existent and after hours of phone calls and even taking the equipment to their offices plus numerous emails I have received no feedback. Try and cancel and they threaten you with penalties. So stuck paying for a service I am not getting. No customer service. Part of my job requirement was that I have wifi at home but as this is not the case and couldn't afford to keep buying data no longer have the job. Holidays ruined for children as guess what no wifi as such they couldn't play games. It would be nice if someone got back to me. And please don't say you can send team to my home but I must pay as ridiculous.