How can they keep taking more?

May 25, 2015

Hi i was paying csa every week i dont earn much 250 a week just now as work not busy.

I phoned and asked how much i would pay and they said that i would be left with 215 every week as they would take at first 53 a week then it went down to 43 a week now they are leaving me with 170 a week.

Is this right or is there anything i can do?