Originally Posted by 3alarmer

.
...I think there's some information missing. Sealed unit BB assemblies come in an assortment of varieties. Some have aluminum cups (not really "cups", but are commonly references as such). Some ogf them have nylon/plastic cups. The purpose of these is not, as in the old style of cup and cone, to serve as a race for bearings, but to simply hold the sealed unit assembly in position. Thus nylon/plastic will work for this. The nylon ones don't usually wreck the threading in the shell. They are soft, and generally conform to whatever they discover inside by way of threading. And as already mentioned, there are a few bicycles still made to the Italian standard, with RH threading on both sides.

I don't know if this is your circumstance. Really, without disassembly and inspection, there's no way to know what's going on with your bicycle at this point.

I wouldn't panic yet, there are some fixes. But it doesn't sound like you're in a position to employ them by yourself. If you're asking whether the guys who sold you that bike screwed you, maybe or maybe not. Depends on what your threading looks like, and the whole situation as you describe it is rather mysterious to me.