I have been making payments to a collection agency for over a year now. It is according to a settlement plan they agreed. They had told me that there the interest would be waived off. But recently I realized that the debt amount keeps increasing, though I am making regular payments. I called them and they said that the interest is being added and they cannot help it. They lied to me earlier. What can I do not now? All my efforts of clearing the debt have been vain.