Like many said above, it was someone from a marketing company trying to sell some sort of protection plan (apparently through RBC). I went through the same process of them calling & someone else answering, me not being home, and him saying "its not important, I'll call back."
They say they offer to protect stolen things such as credit cards, cell phones, etc. by only having to call one number after losing something and they take care of the rest. He kept asking me to confirm my first and last name to send out a package by mail, but every time I tried asking for more information (like asking if I had to sign up/give my information to receive more information), he'd change the subject, which set off red flags for me. After my inquiries, he finally just abruptly ended the call. Seemed fishy.
I found similar info on the RBC site, but some of the info the caller gave doesn't match up with the website. I believe this is what they are trying to sell, as it sounded similar to what he was talking about: http://www.rbcroyalbank.com/cards/documentation/cardassist_plus.html