i have a similar problem with Virgin, this might help though, an email i received from Consumer Direct
Consumer Direct
Thank you for providing the additional information, under the Supply of
Goods and Services Act 1982 as amended and Common Law in Scotland and
goods should be of a satisfactory quality and a service carried out with
reasonable skill and care.
To enable a cancellation of the contract with no penalty you will need
to show the trader is in breach of the above.
A recorded delivery letter should be sent stating the above and seeking
response within 14 days.
If there is no satisfactory response please contact Consumer Direct and
the details will be referred to Trading Standards.