Complaint Review: Petland in Dunwoody GA

My boyfriend and I bought a "pure-bred" AKC registered black & white boxer from Petland in June 2012 for $2000.  At least we were told he was pure-bred.  I have now discovered online that black hair is not in the pure-bred boxer gene, so he can't be pure-bred.  He is now 9 months old and has been sick ever since we brought him home.  He has had a UTI, an E-coli infection, mange, worms and an eye-infection.  We were told he was chipped and de-wormed ... not.  My vet can't find a scan for a chip, so we'll have to have that redone.  He also can't be crate trained.  Since he was "taught" to pee/poop in his crate and never went outside, he doesn't have an aversion to it.  9 months old and still pees in it at least twice/day.  He is also very small for a boxer, esp. a male boxer - probably was the runt at a puppy mill.  I have learned my lesson about Petland and I would warn ANYBODY who is looking for a dog to stay far far away from it.  We never even went back there to pick up his AKC papers.  Why waste the gas money for worthless docs?