I send a cover letter with the garnishment copies notifying the customer of the amount charged to their account for the garnishment and processing fee:
"We have been served with a Notice of Garnishment from (garnishor), a copy of which is enclosed for your records. We have charged your checking account no. xxxxx the amount of $xx.xx for the garnishment, and $xx.xx for our processing fee. Enclosed are copies for your records."
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Let's start at the very beginning; A very good place to start...