trying to restore from iCloud and wrong apple id comes up

Had to restore my iPhone and trying to restore from a iCloud back up and when I start the process on my phone it bring me to a apple id password and I can't do anything . Example below

1. hello screen-done

2. Launguage-English-done

3. country-USA done

4. choose WIFI-done

5. location services-Enable-done

6. restore from iCloud back up-done

7. Enter Apple Id and password-done

8. terms and conditions-done

9. Choose back up done

10. enter the apple id password for email! Well that apple id is my old email and when i put my correct password it says incorrect apple id or password???

Please help I have to back up from iCloud because i have very important work info and I tunes back up is from 3 months ago

Please help thanks in advance