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Leases of this sort are covered by the Consumer Protection Act. Read this:
If they breached the Act you may be OK.
I suggest as a first step you call the Consumer Protection Branch and see what they say.
After that you may be able to file a complaint with them. If not your next step would then be to have a lawyer send then a letter explaining the law and asserting your rights. If that doesn't work you may need to have a court decide.
Yes they are in breach and as well they are the experts and you relied on their representations which at best were unclear.
This is about contract law and you want to receive damages to put you in the position you would have been in had this not happened.\So you have to figure out what you would have done had they been upfront with the costs.
This is complicated and so you can see why retaining a lawyer to assist in this issue at this point would be good.