1) return the bike for a refund :)
2) keep it, but discounted :)
3) if you keep it then I'd suggest a YST bottom bracket. They are cheap and of pretty good quality. The one on my Holdsworth is doing very well, but have a LBS tighten it for you, as I did it, but then it unscrewed!
4) re-do the threads
then there are much harder solutions, but also expensive.
If it is stripped you've got few solutions:
1) return the bike for a refund :)
2) keep it, but discounted :)
3) if you keep it then I'd suggest a YST bottom bracket. They are cheap and of pretty good quality. The one on my Holdsworth is doing very well, but have a LBS tighten it for you, as I did it, but then it unscrewed!
4) re-do the threads
then there are much harder solutions, but also expensive.