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What province are you in?
When is the last time you did work?
How much you are you owed ?
I suggest that you send them a letter by Registered Mail and in the letter give them a deadline that is very short to pay you in full. Tell the if they fail to comply you will commence legal proceedings and will be seeking interest and your costs.
If they don't comply you can sue the in Small Claims Court and can self-represent. If it gets that far and you find you need some help as you go through the process you can always post on this site again and I can assist you further.
I am terribly sorry for the delay. Shortly after answering you I became ill, unexpectedly, was not able to go online for the rest of the day. I do apologize.
That evidence will be enough. It is really substantial evidence and I cannot think of anything else you will need. You will testify under oath of course and that will be the bulk of your evidence. The other potential witnesses and the documents are great.