maybe the real question is if the banks would even know were the person was and if those debt collection agencies would have any legal backing for that debt in China.
Looking it up, the answer is no- debt collection, at least in the shady form it takes in the west, is illegal in China. Whatever debts are demanded due have to be presented by a lawyer to courts.
If you ask me, that's a good thing- just as the credit industry should not exist in the form it does (and China has prevented their country from being flooded by cheap consumer credit), debt collectors also should not be allowed to exist, certainly not in any way akin to how they do in the west.
It may sound bloodthirsty but if it were up to me? Such predators who target the working class in particular, and with such notoriously corrupt and coercive, often illegal means, should be sent for re-education- the repeat offenders, lined up and shot, and that is the generous treatment for them- as I certainly am also a believer in that there is a considerable value and importance in the societal concept and expectations of justice, if I had such power I would even publicly flay them if they were abhorrent enough, or have them handled by the mob. Because if worst comes to worst, medieval problems certainly can and do call for medieval solutions. Those who inflict cruelty have no place to complain when it is turned back upon them, and that satisfaction is something politically relevant, and I'd argue- psychologically necessary, for the individual and for society, to some large degree.