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How much do they owe you all together (I do not know how many people were in your party)?
What province is this, please?
You can send them a letter by registered mail. In the letter set out the facts, and that you demanded a refund and they refused to comply with the terms of the contract. Give them a deadline for reimbursing you for the full amount that you demand in the letter. Tell them that if they fail to comply, you will commence legal proceedings and then will be seeking the refund, damages, interest, and costs.
You can sue them in Small Claims Court and 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.
You are very welcome.