Is there a federal code 830-88 that is service of a summons?

It's a scam. No worries, just ignore him.

If this was not a business to business loan, and he is not the original creditor, his actions violate the Fair Debt Collection Practice Act. You should note that to him as you are allowed under Federal law to sue for actual damages, $1500 statutory damage and attorney fees. Find an FDCPA knowledgeable attorney in your area as soon as possible.

I would suggest you visit a law library and look this one us yourself. But as to what what said, it is a threat they use to get people to pay. Tell the person you will be happy to respond to a properly presented claim in writing with accompanying proof of claim. If you have ever done one of these pay day loans, the presented material should be clear to you what you need to do. All amounts are always negotiable. They do not want to expend money to collect, so you can save by negotiating.

Teel him he cannot come to your place of work, you have never entered into such a transaction and will not pay without a judgment so, see you in court. That if he does come to your work you will have an attorney and sue him for any and all violations of federal and state law.