free good

dear sap gurus i have one problm,

in free good exclusive i have given 2 goods as free for every 10, but the customer returned the goods because low quality, but when we r doing returns, should we take 10 r 12 as return quantity?

if we take 10, comny will loss remain 2 goods.

if we take 12, we have to give price for 12 than again loss for the comny.

please solve this problm................