Why is Apple being so annoying

So my iPhone won't let me buy any apps whatsoever because it says my security code is "invalid" when all of my information is correct from my card. Apple told me to call my bank and my bank told me to call apple. I did both and they're both stupid. Has anyone had this issue and how was it resolved!

How to sync my iphone 4s to itunes?

I just got the iPhone 4s from cricket today and I'm trying to sync the music from iTunes to my phone. I downloaded iTunes 10.6.4 (I think that's the most recent one) and when I plug my phone into the computer it says that there was an error and iTunes can't connect to my phone. I even tried to do it from my phone and it says it needs to connect to the "owner pc".

Iphone won't turn on and charge! Won't connect to itunes either?

My apple iphone4 'Crashed' while i tried to crop a picture. I've been using it pretty much all night, battery was 100%.It won't turn on, connect to itunes or charge. I'm really scared.right now i touched it, and its hot. It wasn't. Does this mean anything? Usually it gets a little hot when i charge it and use it too much.
Could I maybe drained the battery?
Should I go and get it repaired? I have no idea what's happened.
Also, Where can I get it repaired? How long will it take? And how much will it cost? (i'm not on contract) I'm really scared, i need to sort it out.
Should I just leave it for a few days and maybe it will come on itself?:/