Assuming your happy with the rest of the vehicle you bought, I think I would be happy with a totally new engine, which it sounds like you may get. I would not accept a reman, have to be totally new and original. There should be no carryover from the engine to the rest of the vehicle and I think it very unlikely you will get an entirely new vehicle.
Sorry for you as this for sure ruins your new vehicle experience and may put you off your new vehicle for good. OTOH, with a new engine, and everything else working fine, you will in time forget about this happening. Hopefully this is the scenario that will play out for you.
Good luck.