Someone wrote:<p>> I would suggest doing what i did with ebay, find their head office address and send a signed for letter stating all the transactions that need paying and proof that funds were not received<p>That's what I'd do, because that's the SOP in France and probably all of Europe. A registered letter / "signed for" letter / lettre recommandée / whatever it's called in your jurisdiction has some legal weight whereby the procedural clock starts ticking once it's delivered. The receiving entity is pretty much obliged to respond in a timely matter and escalate internally, because otherwise if the matter eventually goes before a court, they will, among other things, not be able to argue ignorance or negligence on the part of the sender. You can also typically send an electronic certified letter whereby the post office prints and delivers the letter, thereby effectively acting as a notary since they have a copy of the content.