Product: Payday loan, title loan, or personal loan

First issue that I have is when I got the loan. There are two XXXX locations within a mile of each other. I had stopped at the one at XXXX XXXX XXXX and that is where I originally received my loan. That loan was set up in monthly payments that was broken down over 5-6 months paying the loan off. Which is the type of loan I wanted. Then I came back in a couple weeks later and requested a larger amount to handle an expense that I hadn't calculated before. Expecting everything to remain the same, I was told it wouldn't be a problem. The employee then tells me that due to the amount of my loan that I was going to have to go to the other XXXX down the road and they would take care of everything else for me and get me the amount I needed. So I go down the street to the XXXX at XXXX XXXX XXXX and they have me do application and take pictures of my car. I am approved and the paperwork is completed. No one telling me yet that I have been switched to a different type of loan or anything. It wasn't until I came in to make my first payment that I found out the type of loan I was in now was every 30 days and not the 5-6 month loan. Which the 30 day loan charges more interest and is not what I was trying to go with. 
When I came in to make my XXXX payment, I inquired about putting a large amount on the principal of the loan. Specifically, I ask that if I were to make this payment today, could I pay towards the principal of the loan without being penalized. The answer I was given was " oh yea, you can put whatever you want to the principal of the loan at any time. '' So, on XX/XX/2018, I came in to make an {$1800.00} payment. After I make this payment, I'm told that the interest that is due for the next payment doesn't include the {$1800.00} that I had just put on the loan and in fact that I had to pay the fee amount from when I made the XXXX payment before the {$1800.00} was applied. Which Ms. XXXX wrote it all down for me. Amounts and dates and totals on my receipt. If I would have known this information, I would have applied the principal payment at the same time I made the regular payment since I had to pay interest on the amount from that date anyway. So I paid {$1800.00} then in a couple weeks after that I was forced to pay a payment of around {$400.00}. 
There was no explanation or information given to me for the events described above. I was lead to believe I wouldn't be penalized for something when in fact it cost me the same amount as if I never had made the principal payment. The last thing is that all the amounts that Ms XXXX had written down on my receipt are different than the amounts that actually came to be in the future. The amount she said I would need to pay on the XXXX of XXXX was higher than the amount I was ask to pay on that day. Along with the total loan amount and principal amounts. When I ask why I wasn't explained any of this information or why I was lead to believe otherwise, all I received was an apology but was told there was nothing they could do regarding the matter. So I ask for all the documents regarding the loan and the disclosures, in which I was given the very first page but nothing that explained any details about the loan. And had to tell the gentleman again at that time that I wanted all the paperwork regarding the loan which finally I was given more info after about 15-30 min of having to wait even longer. When I ask why I hadn't been put in the same type of loan I had originally agreed to, I was told that because I ask for more money, I was forced into the other type of loan which to me makes no sense whatsoever.