So the one time I break from my normal routine I get stiffed. Normally I'd have the customer fill out a customer form with all their info and sign off on card payment. Then I would put their card on file, perform the work, and charge them. Well just before christmas I did a leaf cleanup and just went ahead and did the work after verbally agreeing on price and that we would do a payment over the phone later in the day (customer was at work while I was on the property). at one point like 5 weeks ago they apologized it was taking so long to get back to me. But havnt heard a peep since that. What should I do here? I have no invoice, no written estimate, can I send a demand letter?