Just checked the store where I bought it from, and they are sold out of 24-70's. That means they don't have one to swap with mine, greeeaat.... I'm going to sound whiny now, but ever since I started photography the only things I buy new are camera bodies, lenses I have always bought used except for a very select few times, and EVERY SINGLE TIME I have had loads of trouble and had to exchange and send for repair and swap ... I'm never buying new lenses again I must've owned 30-40 lenses, 98% used, and not had one single issue with any of them....
oh what a nuisance. so have you got one on order with them to replace it later or did you just return it?
i can understand the frustration. sometimes it feels like i have trouble with practically anything i buy new these days. maybe QC isn't what it used to be.