Sorry, but this doesn't prove anything. It just shows that one of your accounts got banned. It doesn't even show the account's username.
It's also a bit weird you have thought of taking screenshots for your conversation with customer support but you didn't take screenshots proving you received a tip!
If you are sure you didn't break any of their terms then you can start an accusation thread for banning your account without a valid reason. I doubt your case will get much support, though.