Does anyone know what to do when a parent stops paying child support?

long story short my ex husband has stopped paying child support going on 2 months now, as of right now he owes $2000, I contacted the court house yesterday assuming they were on top of it but it seems all they do is send out a letter but I advised them he has moved out of country and the address they have is his mothers house in the state I live in now, and I know for a fact she doesn’t open his mail so chances of him ever seeing that letter are slim to none. The court advised me I could file to have his license suspended but they’re completely unaware he’s been in a different state for the past 2 years because he never updated the information.. I have no information on him at all, besides his phone number. I would assume he’s got a new license in new york where he’s lived the past 2 years but I am not sure. Can he just get away with not paying child support?