Worst case, if you don't get a refund you could try to brute force it.
But yeah even if you do manage to brute force it then it's likely that it is stolen... (or do the recovery mode trick as recommended before)
It will be interesting to see what happens next. (although sadly, at the expense of your bank account)
Good luck, it's a shame because it still seems like a nice device.
(i personally don't use google play, i just grab my apps with Yalp Store)