First thing is first. Are you the owner or manager of said business? First interaction you should make it clear that your company is set up and not interested. The caller should have understood that from the get go and ask if he could check in on you in a few months or two quarters of the year and go with you answer. It seems he calls your company every day or once a week, which is pushy and arrogant. If he does business with your company that is one thing, but he is trying to get a contract with you. If you are the manager tell him you will pass the message to the owner and the owner would get back to him. If you are the owner then it should have stopped there immediately. I would not feel bad if after a few times he does not get the hint and you finally told him to fuck off.