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Then that someone lied.
There is no way to bypass the iCloud activation lock unless you are the original owner and have the purchase receipt, or you know the Apple ID and password used to lock it.
If you can, return the ipad for a refund. If not, then there's nothing else you can do. The iPad will be useless to you.
Question: I bought an Apple Watch and the iCloud is locked and can’t get in touch with original owner, how can I unlock it