Billed for cancelled service and missing equipment

I cancelled services at two properties. I never received a waybill to return equipment from the first property but did confirm on the phone twice that service was cancelled. When I received the waybill to return equipment from the second property the agent said to just include the equipment from both. Then I was billed for services at the first property. Telus credited the services but not the taxes however I didn’t complain because I just wanted the account cancelled. Then I was billed again. Now I am being billed for the services again and equipment missing from one of the properties (even though all of the equipment was in a single box). 

This account was for someone who passed away last year and I have been trying to cancel it ever since. At this point I don’t even want an apology or an explanation from Telus. I simply want confirmation the entire account was cancelled and no payments are due. 

Who can I contact at Telus to make this happen? I am tired of phoning the support team and being forwarded from one person to another.