Praise be to Allaah.
You have to tell your bosses what really happened, and offer to repay what they spent on you because of the treatment, or to let them dock it from your wages. If they let you off – and if they are in a position to do so – then you need do nothing more. You are not free from blame unless they forgive you or let you off, or you repay them. And ask your Lord for forgiveness for your lying and wrongdoing.