Per the rules:
As has been previously stated, the administration is here to help as much as possible, but we are NOT obligated to play the role of mediator in sale/trade related disputes. This does not mean we don't want to know about them. If someone is a bad seller, we do want to know, but it is not our job to get your money back, or force the seller to send your item. If you are unwilling to accept the risks involved in online commerce, do not buy or sell here.
Your best best is to reach out to the seller agai and/or bake them. That usually lights a fire.