Trying to remove activation lock but it says the Apple ID cannot be used to unlock
I am providing the Apple ID and pass which was linked to my older iPhone to unlock the activation lock but it says the Apple ID cannot be used to unlock.I have tried many other alternate IDs but none responds.Therefore I believe it’s an error so I need support to know what can I do further to unlock?I also removed it from my iCloud before erasing so why is it still linked?I have also restarted it several times but the same happens also I have linked it with my newer iPhone to transfer the informations but still nothing happens.Please help me get rid of this issue!
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iPhone 6