If your plastic surgeon made them smaller and they are now larger, that tells me the fresh scar tissue (which is thinner and weaker than normal skin) stretched out post-op. How long ago was the surgery?
As Robyne said, it depends on how ethical the surgeon is. It's customary for the revision to be free of charge (except for anesthesia and O.R.) but now some plastic surgeons try to weasel their way out of that too