Being charged for cancelled servic without invoice

Hi community, not sure if anyone else had gone through similar predicament. I got Telus mobility - home security bundle through a door to door agent. It was a good deal and when I contacted their customer care for some billing concern, they informed me I had a promotion plan for Telus streaming available for my mobility account. So I accepted it. But it became quite clear that Telus doesn’t have network coverage near my home or work area so switched back to my earlier provider within 10 days. So I contacted their customer care and processed cancellation of mobility and stream + service. I settled the final invoice I got for mobility and that is clear. But they are still charging my credit card for streaming services even though it is not shown in my Telus account login. When I contact their customer care, which I have done multiple times, they too confirm that I don’t have streaming service in my account. So how are they deducting money from my credit card which I set up for auto payment of home security? I only get invoices for home security and nothing for streaming ( if they had, then it should have shown account details). Is this legal to deduct money without invoice? Their customer care and loyalty team wasted my 3 hours today without any guarantee if the billing will stop or if they will refund my money. What are my options? Hope I will get any guidance in this internal portal before going on FB/Reddit: Google