Calling me telling me I signed out for a gambling site and they have free stuff for my I gust need to give them my visa number and it will not be charged

This number is an automated call from a colletion agency enterprise. If you have blocked them or ignored them ( collection agency number ) in the past, they will try a random phone call from an automated phone line service ( that doesn't exist anywhere ) to see if you really exist or if you just ignore them. If you answer the call, then they know someone is using that line. If you don't then, they might stop calling you.

This number has called me twice in the last 20 minutes, did not leave me a message.

This number has called 5 times in the last  1 hour without leaving a message. I don't answer numbers I don't know. A google search says the number is registered to a Karen Taylor, at 2 addresses.

The person said its from ruby casino. Scammers trying to get your credit card info.

They keep calling my cell they never leave a message and when I call them back I get a fast busy signal its very annoying how can i block them???