iphone 5 is already approved for unlocking. but my iphone 5 is still lock

Here is an email from ATT saying my phone will be unlocked..

Thank you for contacting AT&T Customer Care about unlocking your AT&T Mobile device.

We have reviewed your request and confirmed that the device may be unlocked.

Please allow 24 hours upon receipt of this notification to complete the unlock process.

1. Open iTunes on your Mac or PC and verify that you have Internet connectivity.

2. Ensure the original SIM card that came with this device is inserted in your iPhone.

3. Connect your iPhone using the dock connector to USB cable that came with your iPhone.

4. Backup and restore your iPhone using iTunes. For information on backup and restore, please visit http://support.apple.com/kb/HT1414.

5. After restoring, your iPhone will be unlocked.

I followed the steps and still Not unlocked yet. I do not know what to do. it has been for a month. please help