Why not send them a "formal demand for payment" by way of registered letter.
In the letter state the amount owed, how much interest has accumulated, the per disk
Rate of interest and the time that it has to be paid by. If they don't pay it by that date
State that you will elevate the outstanding debt to the next level which is either a collection agency and/or small claims court.
Make sure you follow through with what you say.
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