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Hello and thank you for contacting us. This is Dwayne B. and I’m an expert here and looking forward to assisting you today. If at any point any of my answers aren’t clear please don’t hesitate to ask for clarification. Also, I can only answer the questions you specifically ask and based on the facts that you give so please be sure that you ask the questions you want to ask and provide all necessary facts.
I read your facts, is there a specific question with which I could assist?
Do you have an amount specified in your contract with the customers?
What is the basis of the charged amount? In other words, what did you sell them?
All right. The normal maximum amount of interest on a "charge" like this is 6% per year if you want to avoid any chance of usury claims.
Unfortunately, the website that I use for Texas statutes appears to be down right now so I can't give you a link to the section. It goes offline pretty regular but is usually back up within a few hours.