Online Security Added onto Bill

Wondering if anyone else has had this issue... 

I had an 'online security' charge on my bill for Norton Antivirus (a service that I have never used)... unfortunately, for the last two years.

I didn't notice since the bill was essentially the same as what I had been charged previously and I had automated my payments. I only noticed as I'm moving and was looking to have a new tenant take over my account. 

I called Telus, and they said they could credit me for 3 months, and that was it because by paying my bill, I essentially was agreeing that everything was in order

I'm super disappointed as a long Telus customer, and obviously have learned a lesson in scrutinizing my bill. I'm wondering if anyone has had a similar situation and was able to be compensated any more than for 3 months.