Tiscali the inept broadband provider

So after waiting for a month for Tiscali to connect broadband, we had a month of decent usage before the connection went down. 4 weeks and countless calls to support later they still hadn't managed to connect us so we cancelled the contract, quoting a contract clause. This clause basically says if we haven't received service for 28 days we should consider the contract finished.

We won't be paying this inept company for the month of non-service and we won't be paying them anything for cancelling the contract either.