So I messed up. I'm at -1500 money, and I can't go on any contract mission, and erase data isn't available.
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If you are on PC, you should go to (Your User)\AppData\LocalLow\LAGS\RingManSpiritHunt and modify your money in the SaveData.txt file.
Just modify the one that says "Money":, not the other one that says "mMoney:", idk what the latter does.
Oh, also the appdata folder is usually invisible by default, if you can't found it, google how to "show hidden files".