Dubious authenticity and wrong fit

I purchased a pair of size 6p Bootleg "Not your daughter's jeans". I have a pair already and they are a perfect fit. They arrived, and I tried them on but they were a bit tight. On further examination of the Jeans, the stitching around the "Not your daughter's jeans" label was a bit untidy and, underneath that label was another label showing size to be 4p, not the 6p ordered.It makes me think the jeans are not authentic. I think the store should send me the correct authentic sixe 6p as ordered at their expense and have the others uplifted, again at their expense. Very unhappy, and am still waiting for a response from the store with their comments.