First and foremost make sure the buyer actually received the instructions you sent for payment and/or communications – do not just “assume” they did. Email can be lost, misdirected, or end up in a Spam folder so it is always a good idea to solidify a deal by email AND by phone. (of course, if you made a deal, you exchanged phone numbers with the buyer) If you supplied your email AND your phone number you are sure they were undoubtedly received, and clearly understood, you should attempt to continue to communicate with they buyer in a friendly and businesslike manner. Angry words and nasty comments will most likely just make matters worse and you can kiss any payment goodbye. If, after a reasonable about of time (according to your policies which you clearly spelled out for the buyer), if the buyer has not contacted you or paid for the item you should consider it a “no sale” and move on. It’s not worth further the aggravation to get yourself all worked up over it. If you incurred an invoice or paid a fee for any part of the listing or sale please click on the Refunds link here in the FAQs to see if you are entitled to a refund (or voided invoice) and how to go about getting it. Do not wait too long. If you need to report a “no sale” or “non payer” to get a refund or voided invoice you must do so immediately. If you wish to leave “bad” feedback for the non-payer please see the Feedback section of the FAQs. The Communications/Messaging section of the FAQs is also a must.