"I ring through to the Mercury in the presence of the customer. They inform me of the cost (usually about £30 for which he gets a 25% discount) which I collect straightaway from the customer. Done and dusted."
Except that he then seems to get two invoices. "A week later I get the first invoice, which I pay, and after five or six weeks I get a second one, for a tiny sum (and it's not VAT). By this time I've forgotten the details of the original transaction because it was paid and completed. I have no way of checking."
He says he can't get anywhere with this and I admit I couldn't either. Does anyone else get these type of split invoices and, if so, why?