The best bet would be to return the bike to the store, go to a local bike shop (LBS), and get a bike that is good quality and set up properly. They will stand behind the bike and work done on it.
If that isn't practical for some reason (cost?), still take the bike back and get them to adjust it for you, or get a different one, and keep doing it until you're satisfied.
If the LBS seems a little more expensive,
that's why, they usually get it right the first time, and if not, will make it right.
Good luck!
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"...perhaps the world needs a little more Canada" - Jean Chretian, 2003.