To be honest, the chance of the scammers getting caught is pretty low. That's why so many hackers try to steal Bitcoin - if they're good at it, it's pretty hard to track.
You're also unlikely to get your Bitcoins back because they would have to send them back to you. However, what you can do is take precautions for the future:
1. Make a new wallet.
2. Go on to the "security center" of your new wallet, on the left.
3. Take all the precautions that it suggests,
especially enabling 2 factor authentication. You should also block Tor users which Blockchain tries to do (a lot of hackers use Tor so this would make you a bit safer).
If you're serious and intend to hold a decent amount of Bitcoin, you should try a
cold wallet or ideally even a
hardware wallet. Some people argue that if you hold your Bitcoin online it's never safe, and while it can be
reasonably secure, to some extend they're right.
I'm not sure what you mean by "inside hand" but if you're suggesting that blockchain.info did it rest assured that they're legit. You could have fell victim to a fake blockchain.info or phishing link.
You could also be infected by a virus, in which case you need to run reputable antivirus software and you still may not be 100% safe.