You will need to file a notice of garnishment with the court ($100 cost). Before doing that you will need to find out which bank the "delinquent" is currently using. This can be difficult if they have closed their account and changed banks. If you are having difficulty locating their branch - ask around on the forum - chances are someone else is currently receiving payments from them. Call their references on the credit application they originally submitted to you - they might be able to assist.
Once you have their bank info - you file the following forms at court:
20P - 20E and 20F (20F - 1st page only)
Court will receive a copy of 20P & 20E
Delinquent will be sent copy of 20E & 20P (do this a few days later - courier)
Bank will receive a copy of 20E & 20F (1st page completed only - courier)
You then need to follow up at court again with affidavits - form 8A (2 to file) showing proof you served copies to the delinquent and the bank.
Make sure you take at least 3 copies of each form noted above to court - they charge quite alot to make a photocopy if you come up short in requirements.
Once all of these forms are done and filed - you can follow up with small claims enforcement department if they have received any funds.
You can find court forms and information here:
http://www.ontariocourtforms.on.ca/
Before doing any filing - I would contact the delinquent first and try to make payment arrangements with them - if that fails or they fall thru on an agreement - start the garnishment process.
Good Luck with your collections.