My Shelton messenger bag is only some month old. It has a leather "hanger" on the backside, so It can sit on a rolling suitcase. This side is the side that rubber against my jacket when I carry the bag cross body. It seems like the suture on the leather already seems worn on some places. Should I complain, or is this something I have to deal with, regarding "wear and tear"? I suppose if I replace the suture with a new, the same will happen again after a while..