So they gave you reciepts for $550?
How much bond was there? And also how far behind in the rent were you according to your rent ledger?
If the bond covers the amount on the reciepts they provided and the amount of rent you can see owing on the ledger then you don't owe anything...if it works out you owe $286 more than the bond covered then you have to pay. Get someone else to double check the ledger just to make sure you haven't missed something.
The fact that it's been a few months doesn't mean much, our old RE sent letters to the house we had moved out of then wondered why we didn't respond so they called us LOL we had given them our new address too.
Also, don't stress about TICA listing, they can remove you from it once you pay the debt
(DH was listed on there but we got it removed and it hasn't caused us a problem since).
Sort out a payment plan if you can't pay all of the money in one go.