De*****ing customers

I have been dealing with this company since May of last year, my account with them is paid timeously every month. July of this year they offered me a discount? To my understanding when a discount is offered all charges must be included, I am still been charged commissions and interests. Today i called them to ask for a settlement as I am so tired of paying and the account is not getting done. They told me they cannot offer me a discount unless TFG sends them a discount to offer me. I then called TFG and they say that because the account is with HTN they cannot help me and that HTN is lying about the discount???? This is **************** with all the charges they put forward when will you ever be done paying it up????? this is disgusting