Quote Quoting FRCP 26(g)(2)
Other parties have no duty to act on an unsigned disclosure, request, response, or objection until it is signed, and the court must strike it unless a signature is promptly supplied after the omission is called to the attorney's or party's attention
Did you bring the omission to the attorney's attention? Are you planning to wait until you're answering a motion to compel?

Be careful playing hardball with a lawyer on the other side, when you're unrepresented. Assuming you're right, you're going to get what? A signed demand that you have to comply with, but perhaps also a lawyer on the other side who is going to make you jump through a lot of procedural hoops that he might otherwise let slide. If he's even half-way competent, he knows the rules of civil procedure a lot better than you do.

If you want advice on how to answer specific discovery demands, or whether you or your corporation are obligated to answer them, consult a lawyer. We can't advise you about documents we can't see.