Product: Student loan

Hello, In XXXX, I signed up for a CollegeAve loan to help pay my way through XXXX University with the help of my parents. After signing up for this loan, I did not realize that payments needed to be made during school ( as this was not communicated ) so the loan unfortunately went to collections after a year and a half. Although I was paying the loan, it was not consistent enough for it to avoid collections. Prior to it going into complete write-off status, I paid CollegeAve through their student portal 8 payments of XXXX dollars from XXXX XXXX XXXX, XXXX that was not sent to the collection agency. The collection agency had that I owed more than I did. I receiveda letter on XX/XX/XXXX in the mail regarding two different offers that I could chose from to pay off my loan. At the time, it stated that I owed {$5100.00}. The two offers include payment plan one : {$3600.00} paid on XX/XX/XXXX or another payment plan 2 : $ XXXXmonth for 12 months. Since I paid that XXXX dollars through college ave website, I only owed at that time to COLLEGE AVE $ XXXXWhen communicating this with XXXX XXXX, they told me I needed to contact CollegeAve to send over the correct balance, but until they received the balance we agreed on a settlement offer of XXXX to reflect the XXXX dollars I had already paid in hopes they would receive it. After multiple chats and phone calls with CollegeAve, they refused to send over the correct balance and told me there was nothing that they could do. So for the past year since XX/XX/XXXX, I have been paying XXXX in order to pay off this loan. This number was agreed upon as long as XXXX XXXX received the XXXX dollars. Since they did not, I had to pay the remaining balance plus an EXTRA XXXX dollars. 
On XX/XX/XXXX, I was told by the Collections Agency that I have completed payments for this loan and that I no longer owe money. My account has been closed. Today, XX/XX/XXXX, I logged into my CollegeAve account and it states that I owe XXXX. When contacting them about this balance and how it is incorrect, they told me I needed to go back to the Collections Agency. While doing so, Collections again reported my account has been closed and I do not owe any more money. CollegeAve reported there is nothing they can do at this time and that I would need to pay the extra balance that is owed. Something else that is strange is that the XXXX is not due until XXXX this loan began back in XXXX, and the payments were to be completed by XXXX depending on the payment plan. I feel that I do not owe this company more money as they have already taken XXXX dollars from me and now tell me I owe more although the people who they wrote this loan off too state I do not owe more. CollegeAve has not been helpful one bit throughout this process and have completely disregarded me everytime I contact them ( which is at least 3-4x a month ). At one point they asked me to stop contacting them although they were the ones that kept changing the total of the loan that I owed. Not one company has had the correct balance that I owe and are continuously asking for money that seems to come out of nowhere and just state it is " underpaid. '' This is extremely unfair to someone who has just graduated from college and has not began to make money. please help