how do you report shill bidding?

the high bidder for this item has a feedback of 1 and has won 4 items from this seller. coincidence? i think not. any help appreciated. thanks
edited to add: " The PCGS Price Guide shows an MS66 certified coin at USD 90,000.00.." is in the listing for a F15 coin! LMAO
-Paul
edited to add: " The PCGS Price Guide shows an MS66 certified coin at USD 90,000.00.." is in the listing for a F15 coin! LMAO
-Paul
Many Quality coins for sale at http://www.CommonCentsRareCoins.com
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Russ, NCNE
--Jerry