Product: Debt collection

I purchased a laptop for school through Dell in XXXX of XXXX. I purchased this laptop while I was a student, and I set up monthly auto-payments of $ XXXXmonth immediately upon purchase. The total amount for this laptop was {$2200.00}. With this, my account was supposed to be paid in full in 29.8 months. I have been paying monthly payments since XX/XX/XXXX, and have paid almost {$600.00} over the purchase amount due. I am being charged an additional monthly ( financial adjustment is what I think he called it ) fee of {$36.00}, and they have been adding it to my account without my knowledge. I looked through my financial info that I have from Dell, and this " financial adjustment fee '' is not listed anywhere. In addition, this {$36.00} charge that is being added to my account does not come anywhere close to matching a potential 23.49 % APR. 

When I purchased this laptop, I was told that I was purchasing during a student promotional period so I would not accrue interest if paid off in time. In addition, I have a physical piece of paper attached to my account that states, " we will not charge you any interest on purchases if you pay your entire balance by the due date each month ''. I have an interest rate of 23.49 % stated on my contract, but it does not say when I will be charged this APR. 

Originally, this was financed through Dell preferred account credit pay on Dell Financial Services. Since XXXX of XXXX, Dell has switched to Comenity Capital Bank. This is the new bank that has been contacting me with my account delinquency. I have not paid my monthly auto pay since they switched banks, as I have to set it up again and the account did not transfer over to the new bank. 

When I purchased my laptop, my original purchase cost was {$2200.00}. I had been paying $ XXXX/mo on the XXXX of each month. 
At the present moment, my balance is {$1600.00}. 
I looked at my bank statements, and Dell Pay has been lowering my amount paid by {$1.00} each month for almost two years now, and in XXXX of XXXX  I was paying around {$50.00} for my monthly bill. Dell lowered this monthly charge without notifying me. 


I have spoken to multiple people on the phone at both Dell and Comenity, and here are the things I have been told : - Dell no longer has access to any of my purchase history, invoices, transactions, contract, etc. because they have switched banks -I did not make the purchase through Comenity, they are simply the bank, so they also have no access to my purchase history, invoices, transactions, contract, etc. 
-I am not able to access any of my account information on my Dell portal until I pay my overage bill of roughly {$150.00} and change. 
-I am being charged an additional monthly ( financial adjustment is what I think he called it ) fee of {$36.00}, and they have been adding it to my account without my knowledge. I have never seen anything regarding this, nor was I aware it would ever happen. I have read over everything I have, and I don't see anything about this. I can't access my online portal, so I can't see if it's in there at the moment. 

Basically if I want to see my account info I have to pay these overages, but I would like to avoid any of this until I know what is going on here.