I have had the same problem, but no one ever answers, they just hang up after a delay. I'm on the Do Not Call list, but the calls got worse as soon as I added myself to that list.
Here is what my Moderator told me about the problem:
The situation you are faced with is called "Spoofing", fraudsters spoof someone's number and call people.
Your caller identification (Caller ID) display normally indicates the phone number and name associated with the line used to call you. Unfortunately, fraudulent telemarketers may change the information that appears on the Caller ID display (a practice known as Caller ID spoofing) to misrepresent themselves and to trick someone into answering the call.
Since you have received calls with a spoofed caller ID, or calls that you feel are fraudulent, you can report them to the Canadian Anti-Fraud Centre by calling 1-888-495-8501 or by visiting the Canadian Anti-Fraud Centre website.
Unfortunately for the moment, we do not have a way to block these calls.
I understand that changing your phone number would not be something you would like to do since you had it for a long time. A possible solution that came to mind could be to try the "Do not disturb" function for a few days. The feature is available on iPhones and Android phones as well. It will send all incoming calls to voicemail, and perhaps after a few days of the calls not being answered the fraudulent calls will be discouraged.
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If I do decide to change my phone number, I probably will terminate with Public Mobile completely 😞 I don't have this problem with free apps like TextNow or WhatsApp, so I will use an app instead, and I'll notify Telus that their lack of progress with Universal Network Call Blocking (UNCB) is why they are losing me as a customer.
