This happened to my wife a decade ago. Telus wheeled and dealed and she had a signed phone contract at say $50. A few weeks in the first bill changed to $70. When she called and complained they said they had the right to review contracts and alter at any time. WTF. On too of that she lived in a deadzone of service, but Telus said it was the Apple phone and not their deadspot being the problem.
So she asked about cancellation, and they said theyd wave cancellation fees, and to payout the final invoice and send phone back. A few weeks later they sent her a $400 for early cancellation.

Being super mad obviously she told them she wasn't paying it, they sent it to collections.

Which screwed her credit history (which was near or over 800 rating) when applying for a loan. So she talked to creditor and agreed to pay $200 for them to remove the credit blemish. Then the morons at the credit system expunged her whole profile instead of the one claim, so when she went for the loan it came back that she had null credit history-as if she were brand new to the system.

Whenever telus calls I tell the story an explain I will never use telus. Last guy couldn't get it though. He kept saying but we give you a contract, you know what you will pay.. Dude that's what they said last time! Fuck Telus.