HT201328 How to unlock iPhone after porting out number

I finished 2 years contract for my AT&T iPhone 4S and requested to unlock the device. Shortly, I got AT&T email and I followed instructions to unlock my iPhone. I thought it's unlocked and ported out the number to other carrier online. When I inserted the new sim card into it, I realized that the iPhone was still locked. Then I used AT&T void sim card and tried to unlock again and again. It doesn't work. I called AT&T to assistance and it seems helpless.
What do I do about this now?
Thanks

Thanks Lawrence,
Yes, I tried to backup and restore your iPhone to iOS 8.1.3 using iTunes many times, but never got this Cong. message, instead 'Welcome to Your New iPhone'. BTW, my old sim card is locked, so I need to input the passcode and disconnect&connect iTune during restoring.
Searching online, I found it seems that the old AT&T sim card is inactive and I need a new sim card and number to unlock it. Is it correct?

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