We had our social security/disability liens blocked but social security still takes out the 15%. What can we do?

Our Social Security and disability incomes is all we have to live on and the liens have created a major hardship. We have filed all the necessary papers with the financial department and they have blocked the liens on their computer but the social security office is still taking out 15%. We did not receive a notice of the deduction for todays payment but did for the payments on the 4th Wed. and the 1st of the month. Who do we need to contact to get these stopped. Without this money we cannot by food or meds and pay for our rent of utilities.