I started seeing black marks on the vanchetta of my Mono Galliera (where the rings rub the leather) after only 1 1/2 weeks. Secondly, I went back to the store a few days ago & think I like the GM size better. It's only been 3 weeks since I bought the purse, but I've already carried it a couple of times. What are my options? Is it possible for me to exchange a used purse that is in my opinion defective? Please help...