Despite the law, your customer may be unwilling to pay interest on late payment - but they cannot 'opt out' of doing so. In the interests of customer relations, try other ways of obtaining your money before considering legal action.
7.1 Make it clear that you would prefer to come to an agreement regarding the debt.
7.2 Consider applying pressure by placing this customer on a stop list until the debt has been paid.
7.3 Consider selling or passing the debt (or part of it) to a third party, such as a debt collection agency.
7.4 You may ultimately want to pursue your claim for the original amount and interest through the court.
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