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How much are you owed from the new business?
What province is this please?
You can send the small incorporated business a demand letter by Registered Mail. In the letter set out the facts and provide the business with a deadline for paying you in full. State in the letter that if they do not comply you will commence legal proceedings and then will be seeking interest and your costs.
You can sue them in Small Claims Court and can self-represent and 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.