Scam call about lowering my Visa card interest rate if I would verify by giving them my credit card number.   The Bank confirms that this is a scam.

It's a telemarketing company for Fresh Air Duct Cleaning.  If we all report it to the DNCL it may slow them down. https://www.lnnte-dncl.gc.ca/plt-cmp-eng

Got a call from (416) 800-2152.Person with heavy accent identified himself as a representative from VISA asking me about the expiry dates of my Visa cards and wanted to know the 3 digit "security" number(s) on the back side of my Visa cards, kept talking about lowering the interest rates, etc. etc.He was extremely persistent and told me that I needed a special security number in case I spotted fraudulent charges against my accounts.I finally hung up on him.

FRESH AIR DUCT CLEANING. I went along with them and proceeded to book an appointment.  That's how I was able to obtain the name of the Supervior - ALEX DESOUSA.  I was also able to obtain a call back number incase I wanted to rebook my appointment.  So if you want to turn the tables and harrass them for harrassing you call them back at (647) 724-4226 . It's time people get smarter and scare away these pests on their own because the Do Not Call List does not work.

They just called same, supervisor took the phone to close the deal, blocked number but confirmed same company Fresh Air Duct cleaning.   I went to their website and confirmed their contact information.  
I have reported them to crtc as well.

It's a telemarketing company for Fresh Air Duct Cleaning. ?If we all report it to the DNCL it may slow them down. https://www.lnnte-dncl.gc.ca/plt-cmp-eng