Ebay seller shipped wrong drone quadcopter propeller

Yes it happened. Once in a while I get wrong item shipped, this particular item have to do with the version of the propeller, apparently the seller probably did not know about 2 versions, one with the center 2 screws and newer version does not. I apparently have the old version but got a shipment of new version, now what? Well I contacted seller, and very slow respond, like 24hrs+.