Since you're already in debt and basically trying to start over I think your best bet would be to just download the free version as @PH_Carpman99 suggested. From what I understand The Fisherman isn't going to be getting anymore updates and even if it did get updated with the South America waterways you would still have to purchase them individually. On the free version you only have to level up to gain access to new maps.
If I remember correctly when Blue Crab Island became available on The Fisherman, players that purchased it still had to grind levels in order to unlock it.
I don't think support@fishingplanet.com will help you because support for The Fisherman is supposed to be handled by the publisher, but if you don't have any advanced licenses and want to stick with this version your only option really is to log in once EVERY single day until you are out of debt. If you forget to log in for one day the bonus will reset and start from the beginning again ($300).
The free to play version is called "Fishing Planet" (without "The Fisherman" part) in case you don't know and it is constantly evolving with new maps, features, gear, lures, baits, holiday events, etc. that you will probably never see on The Fisherman.