I found out in January, that they hadn't deducted CPP since I started, so we both owed $1200. I paid them back my share of $1200. Should I wait for a revised T4?

I'd like to file my taxes, but don't know if I should wait for a revised T4, or file with the current one I have, and then do a "refile" if needed.  Will the CRA be sending a revised T4, or will my work issue this?