I understand now. Have you spoken to an attorney about this collection activity? If the collection asgency is violating your state law, at the very least, you should report them to your state's Attorney General and see what their take is on it.
Is it possible that they are collecting based on the NSF checks, and not based on the fact that these are gambling debts? I'm not well-versed in the issue of online gambling debts, but it seems to me that perhaps the collection agency may be trying to collect based on the NSF checks, not on the gambling debt itself.
I'm sure another one of our members will come along and post more helpful information - keep watching!