Assist please?

What if the company you work gets sold and in that tax year you get 2 IRP5 but you never knew that you need to submit both and you only submit 1 and after all then you get told that you now need to go to SARS Y.

You can "request for a correction" on SARS eFiling and then redo the Tax Return and submit both IRP5s. Alternatively, you can go to a SARS branch with both IRP5s and ask them to correct for you.