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...it's pretty simple with a pilot pin set of BB taps to chase right past the few threads that you have damaged. Unless you live so far out in the wilds that nobody within a hundred miles has a set of them, that's your best and most expeditious fix. Trying to file off a few threads in order to get the cups threaded in straight, while possible, is a lot more problematic than you might suppose.

You're looking for something that looks like this (in the proper threading for your BB).



There are a number of companies that make them in both standard (English) and Italian. French and Raleigh are hard to find.