I was able to find your business doing an entity search in Delaware, and there is a registered agent listed, so from a contract perspective it sounds like they

I was able to find your business doing an entity search in Delaware, and there is a registered agent listed, so from a contract perspective it sounds like they did perform the service you paid them $500 for. Closing the account may be an issue that you want to pursue separately, but they did do the work you paid them for.