So, here's a scenario that I've never encountered before, but, I guess there's a first for everything. Last October, I did a blow out for a long time customer (5+ years). In January, I still hadn't received payment, so I sent a note and in late January a final notice type note (to 6 customers.... we trust our customers to send us checks after the fact). This weekend the one customer called and left a message stating that she had paid and wondered how I would not know this as she handed an envelope to my workers. Right then I had a pretty good idea what had happened... she's been ripped off by another company. They showed up, knocked on the door and asked for payment. She knew they weren't me, so she asked and they told her that they had bought my company... so she paid them. They most definitely did not buy my company, despite my admittedly bad memory, I would have remembered that. So... my customer was kind enough to supply the name and number of the company she paid who claimed to have bought me out. What would you do in this situation?