Accidently shared battle bay account

I borrowed my friends tablet. He had battle bay installed on it. I wanted to play it as well, so I started it while my Google play account was active. But I couldn't create a new gameplay for myself. Instead I got logged in to his account and his progress on battle bay. Now when I have a new phone I still get logged in to his battle bay.

We removed my Google account on his tablet. We have tried to log out in game and try to re-sync without success. So how do I remove the link from my Google play to his battle bay account?

 

You can't. He will have your account forever.

 

What?! Read something about iOS that it wasn't possible. But that's Apple...
But this is bullshit. Now I can't play this game then. Doesn't this company want to make money?

 

I can't begin to comprehend how a team can be so illogical but that's how it is. They have your account forever and there is nothing AT ALL that you can do about it.

Well unless you want to hack his gmail and clear data on his device.