Alright so I did my due diligence with TELUS.
I requested that they provide me with a detailed explanation on where they overpaid me. I received back from them a notice that I never paid them (of course not, I said I wouldn't until I received detailed explanation) and that I now have 30 days to pay them or they will take me to a collection agency.
I have now moved and contacted the Union.
Any other suggestions? As I stated I WILL pay TELUS back as long as they can provide me with an explanation, which they have not.
I also will be cancelling all of my services with TELUS. Real smart people over there, as I am sure they lose much more than ~$200 with cancelling of the services.