Your bike does not coast at all and the shop that sold it to you does not consider this condition a problem?
If you have not spoken directly with the shop owner, now is the time. Something is very wrong with both bike and shop.
If you get nowhere with an owner conversation, I'd suggest asking local cyclists for the best shop around and taking the bike there. That should get you riding in short order and provide some evidence for whatever action you end up taking against the seller.