Many companies run IRC servers... that's not that big of a deal.... Also the BO Port (31337) is filtered.. I'm guessing their catching people scanning their network for the port.

I wouldn't be too concerned about the port listing on the system... They are a webdesign/hosting company.. and more than likely they offer other services to the public.... Also you are in the wrong, you never should have scanned a system that isn't your own and has nothing to do with you. They may host your company's website but that's your only relationship with them.... Stay away from their system is my advice to you... it's better for you, for their company and saves their admins the headaches of having to figure out why they are being port scanned.....