Thank you for your question. I look forward to working with you to provide you the information you are seeking.
I am sorry to say that if there is some past due balance that has not been paid, even if it is part of a dispute, then any future payments you make are first applied to the past due balance and if they are not sufficient to cover the past due balance and new payment, then your new balance is short and becomes delinquent.
If you disputed a particular fee with them, then you had to go to court and fight over that fee to get a court order declaring that fee improper or reducing that fee. To simply refuse or not agree to pay the fee, even though they said it was "fine" does not mean you do not owe it. They said it was "fine" because they knew they would continue to charge you for it and it would accrue fees and penalties.
At this point you need to either take them to court for a declaratory judgment disputing the fee or you need to make some deal to pay it up and get current to avoid future late charges and penalties.
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Also remember, sometimes the law does not support what we want it to support, but that is not the fault of the person answering the question, so please be courteous.