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You could sue google and in order to succeed you would have to prove that you sent them all of the proof they required that your hacking issues and spam issues had been corrected and you had proper security now in place as they required and they still refused to reinstate access. Not to lie to you, the cost of this suit could be expensive and you would have to sue them in CA where they are located, but if you prove that you provided them all of the information they required to release the email and they refused to do so and as such you suffered a loss and you can prove the amount of those losses, then you could sue them to recover the damages.
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