Like buying a car with no tires - Presma AR-15 A2 Style Fixed Stock

I ordered this stock for a rifle build. I should have noticed it only shows a side view with the sling attachment. When it arrived it had no spacer or top butplate bolt. Contacted Optic planet to ask about missing pieces. After a few emails they said manufacture says it doesn't come with them but sold separately. No where in description does it say this is just a replacement stock if you have the parts or you need to add the parts when ordering. Who sells you a car then say you have to buy tires extra. Now they offered me to return for credit with a print out shipping label. There is no fed ex or ups drop offs except 45 min away. So that is an 1.5 hr round trip for me. Now if i want to order the parts to finish the build it will only cost me $25 more for (2) $5 parts plus shipping again. I just paid $10 to ship the stock. So now i would have paid $38 to get the stock with shipping and now $25 for adding what should have came with it.