You will need to bring it to someone that has a flashing box like the Z3X. They can remove the Google Account Activation lock. Maybe you might find ways to remove it from information on the internet without needing a flashing box.
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Update: So for Samsung Account locks, it seems like they can't fully be removed, only bypassed so once you've bypass Samsung Account it will lock up again on system software update or factory reset of the phone.
You will need to bring it to someone that has a flashing box like the Z3X. They can remove the Google Account Activation lock. Maybe you might find ways to remove it from information on the internet without needing a flashing box.