eBay

I bought an item, hours later, same day before 11am, requested to cancel order.eBay says seller has 3 days to respond or reject.I messaged seller x3, no response.3 days later,(this morning), seller ships with tracking number.Never responded to emails...

I bought a item Wednesday, estimated delivery is Monday.No tracking number, not shipped.Seller don't respond to emails. Do I ask for a refund?Seller won't answer.