You need to file dispute through the resolution centre instead of buy telephone.
If you did not file a dispute within 45 days of end of sale, you cannot do it now either by phone or resolution centre. From what I've read from another buyer, you have 90 days from date of payment to file a charge back with your credit card company. I don't know if that is with all of the companies or just their company.
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Non payers should get unpaid item strikes and be added to block bidders lists. Period.