Subscription Problem

Renewed subscription to Norton 360 on PC in FEB, 15 . This week PC died and  Bought new MAC to replace PC. Today was told that 360 is not compatible with MAC so I cannot transfer my subscription from PC to MAC. So,I would like to buy Premier security for my MAC but was told that the amount paid on remaining subscription is not transferable to new subscription. If this is true,  I will just keep Norton on the old PC as it is "recycled" and will search for another source of security besides Norton for my new MAC.