What Otlecs writes is true.

I had one account hacked few months ago. I also got it suspended because its security had been compromised. You will get yours back once you get the chance to explain your case. You just need to be patient.

I think it is standard procedure that credit card subscription is disabled after an account was suspended. I had to call Blizzard to have the option re-activated after 3 of my accounts were temporarily banned for "online trading activities" (I didn't do anything wrong by the way, as was later admitted by Blizzard).