Product: Student loan

I've been paying for this loan for almost 25 years but I have paid XXXX but the loan was only XXXX. I paid twice for the loan with the interest which is considerably high and they still say I owe them another {$4000.00}. I've been asking for deferments and forbearance 's and they said I can't get anymore. I was I was trying to get them because I am getting treatment for XXXX  XXXX XXXX XXXX and can not work but yet they still keep sending me payments they have increased my payment which started out with {$120.00} to {$130.00} to {$1100.00} a month it has went up significantly they're trying to get me to pay it off in 4 months. So when I was delinquent they decided to rewrite it I never signed anything no promissory note they never had me sign no agreement to redo even the XXXX {$1000.00} and they switched it when it I didn't pay three payments and they switched it to start the thing making me pay {$450.00} a month. This seems to be illegal without my consent or my knowledgement of anything they did and they are constantly going up on the interest rates and keep switching the payment without me signing nothing especially the monthly payment when I thought they were supposed to be fixed company a fixed loan so I thought the fees and the interest can never be changed. I have advised them over my health condition and told them that I can not work and that I am getting XXXX treatments and yet they are still harassing me for these payments and are still steadily increasing them monthly payments. They also took it out of default and started a new payment plan which I didn't even sign for or didn't agree to or call and ask this is the pay like the XXXX a month. Can y'all please investigate the student loan company because they are giving me on unfixed rates and I have considerably paid double for this loan and they're still harassing me for {$4000.00} more and I have no income and I have a serious illness and they won't help me with anything. I would like this amount waived because I paid more than enough for this loan. I would like to see if I could get reimbursement for the overpayment of the loans for the increase interest and it's possible that I made more payments than I was supposed to because I think this school, XXXX XXXX XXXX XXXX XXXX  and this company, ( XXXX XXXX ) overcharged me. I also would like y'all to investigate why I was not able to use any medical deferments or forbearances because I have a XXXX XXXX XXXX but also this loan ( XXXX ) XXXX XXXX XXXX which is a a private loan should have been waived because I have paid more than double the amount of the loan. They were threatening to take me to court and then all of a sudden is reinstated to a new payment plan and restarted to to lower the monthly payment. Can y'all please see if they had already paid off the loan because I think it was sent to a collection agency which means the loan was already paid off and also they're putting it on my credit report their seriously hurting my credit score and they're making it delinquent but yet they started the payments over there's seriously heart in my score so if it's been paid off it should never be on there and it should be removed. So I would please like y'all to investigate this matter because they have seriously hurt my credit score and they put it on my credit three times but yet they redid the payment plan and said I'm not in delinquent anymore which I never signed anything or paid anything. They also sent me a letter threatening me to go take me to court if I didn't pay anything but I've told them about my serious health conditions and that I have no income and can not work and they still are harassing me. Please contact me for additional information.