Bests & Worsts Reviews from Amazon

I bought this collar back in April but my it was too big which was fine because i intended it to be her grown up collar anyway..... after searching and searching and reading tons of reviews on this particular collars quality, i was certain she would use this one for a very long time but I am very concerned ... my dog is white and after 2 days, there is a huge discoloration on her fur where the chain sits... this collar has never been wet, i remove it for baths etc. but it seems that the finish is rubbing off on her skin. (she is a pit bull and has very short hair) ... The rest of the collar really is amazing quality, strong, durable and seems like it will last for a long time. but if her neck continues to turn grey...it's gonna have to be replaced! I'm hoping the seller will reach out with a suggestion on how to stop it... but i'm not sure if anything can be done.