Telus says this is a virtual number from scammers. They get around Telus call blocking methods. The calls are made to track when you're home so a person can call you back and tell you you have a computer virus. Telus says not to listen to them. If you're getting the calls document the dates/times and call Canadian Anti-Fraud Centre 1-+1 888-495-8501.

its the green party asking for $$$

frequent caller picked up as 'unavailable' by caller ID

No idea who it is. Number "unavailable" , never leave message. Calls frequently.