I have been a Chess customer for many years, but have now closed my business so I do not need their services anymore. I couldn't work out how to pay the final £113 balance as their systems seem to need invoice numbers etc in order to pay. I sent my telephone number TWICE to a named employee in order for him to call me to take payment. He never called - but did find time to send a what I regard as threatening message saying that they would feed me to their debt collection agency who would be 'very vigorous' in their approach to me. You don't talk to long term customers on this way .. especially if you haven't bothered to read emails offering to pay. Nasty, nasty people.