It is too complicated. . Even if you buy a bag, how much is it (MINUS the postage paid by the seller). . It is the seller who wants to refund your money.

The first time you bought a bag (63.7+38+74.8+ 19.75)+ the second time you bought a bag (55+74.8)- the postage paid by the seller for you (17+ 10)= the seller wants to refund your money (299.05).