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The FCBA pertains to billing on revolving credit accounts, not debt collectors.
You do not have an account agreement with a debt collector. I dont see that the FCBA applies to your situation.
As to the increased debt, is there specific statute in your jurisdiction that permits the additional amounts they are attempting to collect?
If not, then any attempt on their part to collect the additional amount would be a violation of FDCPA 808(1).
When you refer to going to court, are you suggesting waiting for them to initiate action, or initiating your own action for attempt to collection an amount they are not authorized to collect?