Hi

Heard on the radio about a company called Cartel. Spoke to them but their charges are £495 then 30% of the outstanding balance on the credit card.

Does anyone else know of other companies offering the same service?

You can very rarely have them actually written off... more accurately just deemed legally unenforceable, this recent similar thread may assist you to make up your mind.

http://www.moneysupermarket.com/community/forums/t/credit-card-agreements-claims-companies-36376.aspx