I think KleinMp99 has it right. Your wheels have come out of true and your lbs should take care of the immediately free of charge, especially within the first 30 to 60 days. Several things to expect when purchasing a new bike. Wheels need truing; Breaks and Shifters need adjusting due to cable stretch and always check tire pressure before each ride. You should also check for loose bolts and nuts and holdie thingies because they also loosen with use.
have fun
t
Ps if they continue to be reluctant about this type of service take your money elsewhere. It is almost a basic principle for shops to do minor adjusting within the first 30 days. Of course misuse and abuse is not covered by this so don’t try to strong-arm your LBS. There are plenty of shops viaing for your dollars don’t settle for anything less than the best.
t