Never ending payments

I have a problem with my woolworths credit account, they handed me to the first company promised to pay R1000 a month i kept the promise for about 3 or more years after they said i am handed over to Nimbles company due to their misunderstanding i promised the company to contunue paying R1000 for ayear or two year then last year i asked for a settlement amount they didn't give me i phoned several days with no help when i ask the amount owing it was initial R75 thousand paying all these years but when i asked them it was more than 85 thousand i don' t know why all these year where my money was going instead it was going up every month i transfere R1000 as from when i made arrangement but it is still going up please help me they are ****ming me.