I have been charged with check fraud from 4 or 5 years ago.. Barrett law is who contacted me today n said I could not fight this. Is this true?

A bank in my town has made their money by cheating ppl n charging them fees. If you have a credit n debit going in at same time, they will put debit in first before credit, then charge you so many fees. On my last chk, they took the whole $2,000 cause they put all debits in even tho my direct deposit was sitting there for them to confirm. Now I'm being told by Barrett Law in LA that I have until end of the month to come up with $2,000. If not then at court I'll have pay $6,000. Like I told them, I'm single mom of a 7 yr old. We live with my parents who are extremely sick. I don't have a job due to taking care of them. I asked if I could fight this cause I don't feel I owe them any money. The person told me no. It's an open n shut case. Now I thought this was America and I have every right to have a lawyer n fight this. So is it true I can't have a lawyer and that you can't fight it and must pay?