Firstly, the chat tab only appears when there's a rep available.
Secondly, that sounds like classic "power button is stuck"
Thirdly, if he adds you as an Authorized User, you should be able to get it taken care of. But, you need him in order to start one of the processes (either warrantying your phone or to add you as an authorized user)
Smplyunprdctble is correct about the chat option. Most of the main pages, like the Equipment page, have a link to the chat site when the chat specialists are available.
That’s very strange about your device just turning off like that. Is the power button lose or stuck in any position? Have you done any troubleshooting aside from removing the battery?
If you can have your dad contact us, we can add you as an authorized user, but you do not need to be authorized to get help with your device - only if we end up needing to replace it completely.
'smplyunprdctble' is right....It happened to me and I was quoted some pretty high prices until I read a post in the XDA Developers Forum, they suggested using a company called mobiletechvideos I am not plugging some company to make a buck....I loved my S2 and the guy fixed to for 25 bucks plus shipping. Google the reviews check out the prices and he does it far cheaper. Also he is on YouTube as well. Mine kept restarting and vibrating I could get to work every now and then yet it was the switch.
I really hope this helps you out.