You are liable to repay him the money because the unit is yours.
He can sue you for the money.
I am surprised that the body corporate was not sending you the Levy Notices.
You should have notified them after settlement that you were the owner.
If you refuse to pay he can sue you for the money and add interest.
If you do not have it to pay in a lump sum you can offer to pay by instalments.
But as the owner you are liable.
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