Broken stationery bike

I bought a stationary bike at Decathlon and when I tried to put it together, I realized that one of the pedals did not fit where it had to. (problems to screw it in), so I can't use it as i only have one pedal working. The machine is brand new. I am unwilling to send everything back to the shop as I have to dissemble it again and take a taxi there (don't have a car) and it gets very expensive, so i was wondering if there is another way out. (Do you think Decathlon would have spare parts and simply give me another pedal or if there is another shop I can get one easily). Thanks for any help. I am quite useless when it comes to these things, so any help would be highly appreciated.