I got a call from them too over the weekend. Correct Telus # on call display, dead air on phone. Since Telus had legitimately called before with that number on display, Call Control let it through.
I got a call from that number today and I have Call Control turned on. First time it was dead air. Second time there was someone who said they were marketing security systems or something. I was driving at the time and I answered it on my watch so I couldn't really hear what he was saying. I told him I wasn't interested.
I read somewhere that certain TELUS numbers bypass Call Control. I'm not sure how Call Control works exactly but if someone spoofs the TELUS number I think it would also bypass Call Control. If so that's a big problem.
I went in to Call Control settings and banned that number. No calls since.