I have an ad on kijiji.ca selling my car, and I've gotten 3 calls from this number so far.  No ad with the trader corporation though.

hahaha these guys are like a crazy stalker girlfriend who just wont go away after you stop picking up your phone.

Auto Trader

- Gave them my CC number! I hope it's legit!

This telephone number is for the head office of TRADER Corporation in Toronto.
TRADER Corporation comprises AutoTrader, HomeTrader, BuySell and various other websites and publications.
If you are contacted by someone who says that they are calling from this number, please ask for the persons name and extension, then call them back to confirm that (416) 784-5200 ext. 9999 is their actual number.
If the person refuses to give you a call back number, or you call and cannot reach the person, then assume that the person is fraudulently representing TRADER Corporation.
Do not give personal credit card or banking information to someone unless you are 100% certain you are speaking with a TRADER Corporation representative. For example, by phoning (416) 784-5200, you are certain to be speaking to a TRADER Corporation representative.
Note that if you have placed an advertisement on a TRADER Corporation website or in a publication, then you have a 'business relationship' with TRADER, and TRADER is entitled to phone you for the next 18 months even if you are on the National Do Not Call list. For example, TRADER may phone you to ask if you have sold your item and if you want to renew your ad.

got a call - but didn't hear my phone ring.  No Message left.

Also have a listing on AutoTrader, so it may have something to do with them - or someone is cruising AT for digits

Asked in very poor English if I had my vehicle for sale.  Vehicle was advertised on Kijiji and Trader.ca, but was removed from both weeks ago.  Person didn't identify themselves at all.