>>Not harsh at all. You had every right to get final payment for the delivered product. I will sometimes build in a 'kill' feature for non-payment. This is date sensitive [around 90 days] with the kill date compiled into the APP.
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>There is legal precedence that says you could get you in trouble doing this. Not that I haven't done it myself, but be aware of the consequences.

Yep. However, I am willing to take my chances of those consequences versus those of a non-paying customer in violation of a contract.