Send a certified letter with a return receipt demanding payment if you don't know the person and can't make contact by telephone. Certify the letter so you're sure the letter was received. You will also have proof that you sent the letter should you need to take legal action in the future.

This is a demand for payment in full for a check or order not paid because of lack of funds or insufficient funds.

Dear [Name of Recipient]: As you will recall, you asked us to re-deposit your [Check No. _______] in the amount of [$_____] after we wrote to you on [Date of 1st Letter], and we did so. That check has now been returned to us by the bank a second time, again marked “Insufficient Funds.”

Also, email it to the client for a faster delivery. Include a letter in your postal mail or a note in your email recapping the date of purchase, when you were notified of the bounced check and the extra fees charged to your account. Respectfully request payment by a reasonable date.

Notify your customer that the check he or she used for payment has been returned. Specifically mention the check number and amount. Request immediate payment. Be specific about the type of payment you now require, such as a cashier's check or a money order.

You are hereby notified that a check, number _____, issued by you on [date of check], drawn upon [bank name], and payable to [your business], has been dishonored and returned without payment.

You are hereby notified that a check, number _____, issued by you on [date of check], drawn upon [bank name], and payable to [your business], has been dishonored and returned without payment.