Wrongful Charge for "Equipment Not Returned"

I closed my home internet account in June 2026. I returned my equipment exactly as directed, and have all of the proof of doing so. I received a July bill for $0, and then just received a "third and final notice" in August for $105 for "equipment not returned." I left Telus because of their extremely poor customer service, and am somehow still dealing with their incompetence and understaffing. I tried the AI agent but that was no help. Of course there is no way to get ahold of Telus because I have no open accounts. Telus please give me a phone number to call to fix this. If I don't receive a response, I am happy to file a complaint with CCTS. Thanks.