Hi lookLuis,
Are your pigs both girls? How big is/are their cages, and how old are they? With a bit of background information I'm sure someone can help you decide what to do.
Your pigs will be lonely on their own, so if they can't be re-bonded you'll need to get them a friend each. It'll be best to work out why they've fallen out first though, to make sure you don't get the same problem again - eg. if the cage is too small, then it's likely that the new pair will also fall out due to lack of space.