Unhappy buyer .What to do ???

I,m having a hard time understanding why it took him 2 mnths to complain.He may have had them in his car,made a few passes and didn,t like them.After talking you down on your price,then complaining 2 mnths later also with them being used parts...Sold as is.After 1 week maybe,after 2 months he owns them.JMO