I own a white authentic gucci blondie. It was bought brand new from a non-authorized Gucci retailer. I know the bag is authentic. 100%. After a couple of moths of storage and some wearing the ENGRAVED Gucci zipper started to turn black or rusted, whatever you want to call it. Can I have them replace the zipper? How does it work? Do they charge you? Do I have to go to a Gucci boutique for that? Please help!!! Additionally, I made the stupid mistake of trying to clean the bag w/Coach leather cleaner, thank God I applied it to a small are (back of handbag) that area it shows a little fading, Can I have them clean the bag as well?