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No it's not the right strategy. It's never going to work.
What you have to do is sue the person who owes you the money. While you are doing that your lawyer can apply to have all of the assets frozen. Once you get a judgment you can have the assets seized.
The bank will absolutely not do anything that you ask terms of freezing accounts. They will need a court order. They don't have the authority to do otherwise and that makes sense. Imagine if the bank would always freeze someone's assets when someone else asked them to!
So if this is all happening in Singapore then your next dyeo would be to retain a lawyer in Singapore.