I sold a t shirt a couple of weeks ago NWT, unfortunately the tag must have come off when I was packing it up to post. It is obviously new as the plastic size strip was still on the front of the t shirt. I got a message from the buyer saying the item was not as described as the tag was missing, she was disappointed as it was a gift ( who gives presents with the price tag on?) I responded the same day saying I would try and find the tag and post it on. I have come back form being on holiday for a week to find three messages form the buyer and negative feedback on a previously unblemished record. I have contacted the resolution centre, AIBU and what else should I do?