Don't get too discouraged just yet. While I have not personally heard of RightBTC, they do push some decent volume on the exchange, so I'd love to assume that it's not a huge scam site. And support tickets on exchanges can take a while to respond. My average support tickets take between a week and two weeks for the bigger exchanges.

Also, in the future, make sure to google the exchange that you're lookig at joining. A lot of exchanges are scammy by nature, but designed very well to fool new users... If in doubt, just come here, use the search feature for the exchange and look at the results. Members here are generally pretty experienced with exchanges.

Welcome to crypto, and good luck learning about and using Bitcoin!