It would depend on which contract you're on. Many do allow for price increases. The only ones that don't, should have it spelled out clearly. Some plans on a contract advertise a discounted rate for the first 6 or 12 months of the contract before changing to regular rates for the remainder of the term.
If in doubt as to the exact contract you are on, I'd suggest calling Telus to discuss it.
Probably best to talk to Telus. I did find this:
Starting with your July 2021 bill, the monthly rate for Internet plans will increase.
The regular rate for the TELUS Internet 1.5 Gigabit plan will increase by $10 per month. The regular rate for all other Internet plans will increase by $5 per month.
If you are in a 24-month term, your price is guaranteed and the increase will not apply until the first bill after your term expires.