This is nasty, I know. I called, I emailed, I complained directly to companies, sent proper Consumer Protection forms declaring I was the wrong person. They kept calling. I changed my numbers from drop menus, only to get more and more calls, most often for Telus debts.
When I got tired of changing numbers and blocking to little purpose, given they'd still leave messages, on my husband's phone I had his voicemail disabled, and then the calls stopped. I enabled his voicemail again after a year, and the calls returned the next day. I disabled, and they stopped. Getting no answer will stop them, but why they return so quickly, I don't know. Some apps said they blocked calls so they won't go to VM, but I had no luck with them.
I needed my voicemail, so I called into my shop and asked for help. My SA started looking through stuff, humming and mumbling, and then he gasped, literally almost choked himself. He was so awesome! But now I have the most beautiful Asian-friendly number in the world! It's been about four years and not one scam or debt call. I paid 35.00, I think, for that help by phone. I don't know if I can call it a customized number given I didn't customize it. I just got lucky. I don't know if Telus still lets you customize numbers, ask though, as that might be a way to go. They'll charge you though. Koodo used to customize for free.
Changed to Telus on spur of the moment when helping senior pal get new phone at Telus store. I just mass delete all the calls as only 2 folks have my cell no. +Telus. But it's major pain in the butt hearing all those calls come in night and day. 
