Rant;Mancini and shipping

I bought a set of headers from summit and didn,t use them until a year later.Found that they were the wrong ones for my truck.Called summit to order the right ones.They had me buy the new ones then send the other ones back for my money back.I allways get shipping up front.I also bought a lot of stuff from mancini but asked for the shippihg price before I gave them my card. Mark