Insufficient Funds check & parents will not return phone calls.
Can anyone offer advice on how to handle an insufficient funds check and a family that will not return the Treasurer's calls? - casachi
If the amount is significant, send a registered letter. Keep the tone low-key -- like this is certainly an oversight -- but be firm in stating that you need payment by a specific date or they need to speak with you. Here's an article about dealing with bad checks that you might find helpful.
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dealing with bad checks: https:/www.ptotoday.com//pto-today-articles/article/172-dealing-with-bad-checks