you may mess the alignment up and not be able to show them their mistake and then pay for it again so i would take it back. if they dont fix it take it some where else and obviously dont recomend them to anyone else. the last thing you want is your tires to wear because im sure they werent cheap. just what i would do anyways.
2007.5 GMC Sierra LMM Extended Cab Long Bed White
4"MBRP Front and MID Pipe to 5" CAT back Magnaflow
3" MBRP down pipe
Motor OPS Auto Cal
Cognito leveling kit
285/75r16 Goodyear wrangler duratrac stock PTO reims
8.6' western v-plow, Transgo Jr shift kit, PCV delete,EGR delete