You had up to 45 days to file an item not received dispute. It's up to you to read the policies and file the necessary disputes within the allotted time frame.
If your payment was backed by a credit card, contact the card company and ask them what steps you need to take to do a chargeback.
You only have a certain amount of time to do it so contact them right away.
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Non payers should get unpaid item strikes and be added to block bidders lists. Period.