Presumably this bike has been bought online or via mailorder of some kind since the OP is having to set up the handlebars himself, therefore the suggestion of taking it back to the shop he bought it from is perhaps not so simple and will be time consuming.
The best bet, other than doing it himself, would be to take it to his LBS, although the seller should pay for the cost of this.
i'm struggling to see why the seller of the bike should pay for the OP to have the bike set-up for him. if he bought it online i would presume that he was imformed prior to purchase that the bike would come boxed and would need some parts of the bike fitted i.e pedals, handlebars and saddle.