I owe Party Poker... what can they do to me?

[JustSaying]

I made a deposit through Party Poker's Pay-Pro system and accidently used my wrong bank account. After playing and breaking even, I withdrew the same amount of money, this time to the account that I meant to withdraw from. However, the initial account that I deposited from did not have sufficient funds, and the electronic check was returned.

I only found out about this because Party Poker attempted to recover the money by taking money from my account while I was playing. Now I have an outstanding balance at Party Poker, and they would like me to pay them back. What kind of credit score damage can they do if I don't pay them back? If nothing else, I would like to make them suffer a little bit for their poor customer service. [img]/images/graemlins/smile.gif[/img]

And yes, I know the right thing to do isto pay them back right away. I'll probably do that, but I couldn't resist getting a response from 2+2ers on the subject.