What bills is he not paying? If it's internet then put a password on your router that disables his access. If it's electric, then disable the outlets in his room. If it's gas, then find a way to close the ducts that lead to his room. If it's rent, change the lock so he can't get in.
Or you can just have a talk with him about it. That might work as well. Tell him that if he can't pay you then he will have to pay late fees. Or tell him he has to move out.
You could also start stealing his stuff. Or hack into his bank account. There are a lot of options.
You could also just take his checkbook and write the checks yourself.
Are all of the bills in your name?