Worst service in the world..

Worst service in the world.. Called lodged on the 20th March one month and 20 phone calls to them later still no answer why my line and dsl is dead. Every time I phone only answer I get is "sorry for the inconvenience" I want to cancel but they say contract is valid to next year. Aren't they breaking contact by not giving after purchase service? Will never, never ever recommend anyone to them ever!! They don't even call back and evert time you speak to another consultant they have another lie to tell and then they escalate your problem. How many times can one escalate 1 problem and not phone the customer?