Running away from debt is only going to compound the misery and credit card debt is the worst kind to continually avoid. I would suggest working with the bank in Singapore to pay off the debt in structured manageable instalments and see if you can pay it off while working and living in NZ. And yes, the accrued debt will slowly but surely diminished.
If you choose to continually avoid the debt, I would think the possible repercussions would be to be declared a bankrupt and have all your assets seized, and you may continually have to avoid travelling to Singapore at all costs.