Since opening my online business, I've had people tell me they paid and demand to know where their order is, when, in fact, they have never paid, and some have never made any type of contact with me before. However, lately, I've been getting quite a few of them. One in particular sent an order without payment, claiming that he just made payment. I sent an email telling him that no payment was received, please double check the paypal to make sure he confirmed payment. He hadn't responded, now, two weeks later, he is claiming to have made payment on 9/29 and demanded to know where his products were. For those who sell online, do you get these kind of people nagging at you, trying to get you to send them stuff without paying for it? If so, what do you do? How long do you "entertain" them and continue asking for proof of payment before giving up and ignoring them?