500 Fast Cash Harrassment Fraud Embezzelment Extortion WATCH OUT!! Miami Oklahoma

I dont even know where to begin or how I can get legal help, to get these crooks to leave me alone. I was one of the dumb and desperate people to take out a $200 dollar loan from these individuals. I was desperate, and had never taken out a loan online before, but I found myself in a medical situation in which I needed extra cash. I am now being harrassed everyday, sometimes up to 10 or more times a day, Im overdrawn by $1200 dollars in my bank account because of this company. I have already paid them almost $400 dollars and they are still extorting me for more money, telling me that I owe interest on a $200 loan! I've tried to close my bank account by my bank wants me to keep it open so that they can try to retrieve what this company has taken from me.

I've tried talking to their customer service department, but all i get are excuses and rudeness from them. They want me to pay them an additional $400 dollars, and I've told them numerous times my loan is paid off!...I dont know what else to do, if there is anyone out there that can help me. They have now resorted to calling my employer, and not only am i going thru the embarressment of them calling in everyday to my job, but I am afraid to open a new bank account with my bank becuase im scared they will hack into my account and make withdraws. This has turned into a nightmare , I have extensive heart problems and all of this has caused me severe emotional and physical problems. I cant find a legitimate address on them, their website is protected and I even paid someone to try to obtain an address or the name of the board for this company but we have come up with nothing.
And now every friday they make several attempts in different amounts out of my bank account. I cant believe that the federal government is not aware of this company and what they are doing. It's like im being blackmailed to either pay them more money or the harrassment will continue. Someone please help me!!!

Taken advantage of!
lancaster, Pennsylvania
U.S.A.