Insync that is recommended elsewhere on this thread offer a 15 day trial, then it's 30 USD/GBP/EUR etc. (USD is cheapest of those, but 3200 Yen is even cheaper.)
Get the 15 day trial, make another demand that Google refunds. Use refund to purchase Insync. Or if they don't refund, charge back and don't purchase Insync.
Get the 15 day trial, make another demand that Google refunds. Use refund to purchase Insync. Or if they don't refund, charge back and don't purchase Insync.