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I already changed my internet plan to unlimited usage. Now I want to remove this service and back to normal one to save money. How can I do it in "My account"? Can I do it on line without calling?
Typically for changes of this type, you'll need to call Telus.
Keep an eye on your data usage under "my account" so you don't incur any extra charge if you go over your allotted Data for the month. As long as you have not been hitting your Data cap for the month(s) you've had your internet you should be fine in removing it.
If you're a heavy streamer (Netflix, youtube etc.) depending on your plan you could be close to reaching your cap.
Viewing your account at My account>Internet>View Usage will give you an indication what you use for the month data wise.