Not only outright terrible customer service, but they repeatedly lie, change 
the terms and conditions they have agreed to, deduct moneys from your 
accounts without permission and generally conduct their business in a 
pathetically dishonest manner.
How can a Company of Setantas size operate in such a sewer rat manner?

Read some of the storys of grief that they have levied out to their 
customers:

http://boards.thisismoney.co.uk/tim/threadnonInd.jsp?forum=98&thread=78688