downgrade from windows 8.1 pro

One of our users computer automatically upgraded from windows 8 pro to 8.1 and keeps asking for activation code. It is not accepting the code that we had for 8 pro. I called activation phone help, and they transferred me to tech support, they transferred me 4 more times, and finally told me to put a request in online and i would be charged for it. So I really need to get back to Windows 8. Is there a way? Thank you.
CubbybulinAsked:
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David Johnson, CD, MVPOwnerCommented:
Is this a retail copy, KMS key, MAK key?
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McKnifeCommented:
Whatever version that is, this may not happen and Microsoft should know that. So try to ask them again kindly and convince them that since 8.1 is a free upgrade to 8 and since you can present a valid win8 key, you are entitled to have them activate your now-8.1-system.
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Windows 8

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