Business ProfileforFirst Data

I received a collection note in the amount of 299 dollars from first merchant service after my business was closed for 6 month. I called them to ask how did this amount been generated, and they gave me the answer of " Maintenance fee" + collection fee + ACH return fee+ service fee. I was explained first time by their agent that I my bank fail to release 20 dollars of transaction fee to them and causing the total amount accumulated to 299 with all the fees mentioned above. When I confront them of how it possible penalty fees can be "1500%", 20 times more than original amount plus ACH is real time transaction there won't be any return charge! The agent put me on hold then the call was disconnected by their agent, and no one calls back. I called them second time to inquire the information again, the different agent explains somehow the 20 dollars was already paid for, so the 299 was generated from a 99 dollars maintenance fee I didn't pay. Still, this is nearly 300% charged then I asked the agent when that policy was become effective, she response 2023 which I never received, then I asked her when they sent out a notice ,she went silence then she put me on hold and disconnect the call after 10 minutes. No one calls back! I email them, they respond was "please give us a call !?" Apparently, this company is lack of training and transparency, a simple question of how did the 299 was accumulated can come back with two different answers, and the questions they can't even answer themsleves. My concern is even any credit card company won't charge more than 100% of penalty fees to customers regardless the situation, a credit card limited in 1000 they wont let your balance went all the way to 3000 with 2000 are fees! This company should be consider a scammer taking advantage of customers. I demand they removed all the fees, or I will no longer using their service.