Sorry to hear that your mats have been creeping along your carpet but glad that you find that they are keeping dirt at bay. Turtle Mats have been developed to be anti-slip, although we cannot unfortunately guarantee that they will not move at all as there are so many varieties of carpet and flooring surfaces that they could be placed on - they may move more on some than others. If you are unhappy the mats can be returned to us unused within 28 days for a full refund or exchange. Checking your order details it looks like your order has been refunded, so it looks like this has been the case and hope it helps to resolve your query. Best wishes, Becca
Rebecca Wilson