MalevolentSin666 I did a bit of asking around and learned that there are a couple of mods that might help you.
ArgonGlow - Bills Rebalanced | Adjusted Lot Tax
sims4me (Bienchen) - Harder Game: Higher Bills
You can google to find them easily. The thing is, since the bills have been delivered, those mods might not work. They may have to be in place or used prior to the bills being generated to work.
What might work for you is if you have a save from before the bills being generated/delivered, you can use that save and place the vault in the Household Inventory, so its value is not counted in the bills. It'll cost you some play time, but it should get your bills paid and avoid the repoman and the ensuing hassle of replacing everything he repos as well as keeping the utilities on.
If none of this works, come back and we'll go from there.
Hope this helps.