Personal Finance Company in Kokomo, IN

I have been paying this place $200 payments. When I'm only required to pay $50 or so a month. Basically I'm paid ahead, but that doesn't stop them from banging on my door every 2-3 days asking for they're $50. They justify this buy saying I have to pay the interest before paying the original borrowed amount. I'm trying to pay off the $3000 loan in a year otherwise I have to pay theey're 20% interest rate, also every time I pay my payment they try to get me to just pay the minimum of $50 or more rather than paying the amount agreed upon to pay off the blance in a year. I was thinking of buying a car through them after paying off this loan, bu tonce this Loan is paid I won't be going back. Instead I'll be going to my credit union which I should have done this first time. I made $105,000 this year so I don't need creditors banging on my door every 2 days and calling my home and cell phone daily. I suggest if you need a loan to try elsewhere unless you want daily harassment over a $50 payment that isn't even late. It's almost like owing the mafia.