Dishonesty, False interest charged,

I called this company to request a settlement discount letter, they told me that my balance is the same as the time that I start paying them 4years ago until todate the balance is not yet moved, now they are playing games, telling me the balance and when I check is the same amount they told me when they start collecting from me, in May this year they sent me an email saying my balance is 8931.01 now is They are saying balance is 11900,00, they want to tell me that within the peroliod of a month they add an amount of 3000. This is a ****. How about the amount that I have been paying for the past 4years, were did it go, No, this is a day light robery.