Similar experience. Spoke to a fast-talking rep named Steven to whom I politely said no thank you. He called again 4 hours later pretending that we never spoke trying to push the free credit score/protection service. Not sure if it's a scam. I tried calling the number back but it does not ring through. Would not suggest giving out any personal information.
Via @AskRBC: "We've checked into this phone # further and it doesn't belong to RBC. You may want to report the calls here bit.ly/2sEucEy ^S" https://twitter.com/askrbc/status/872529116821696518