You should have checked with your lelong agent (if any) on the title status - they would have cautioned you in advance in regards to the double transfer issue.

For now, I would say that the bank had been generous enough in allowing you to extend beyond the usual 90/120 days settlement period - so your only option for now is to do a cash settlement else incur more penalty and/or eventually your unit end up being re-auctioned and you loose your deposit.