Reliance Standard says that I owe them $8,000 in offsets from benefits I never claimed/recieved.

I was a state of SC employee. I became unable physically todo my job. As required by the State of SC I filed disability claims with The Standard Long Term Disability, The South Carolina retitrement company and social sercurity disability. I was first disapproved be the South Carolina Retirement System. I was approved for long term disability benefits by the Standatd. My first application for Social Security Diability. At that point I filed for a review by the Social Security and after a few months I was approved by Social Security Disability. I let Standard know. And provided the $1370 monthly award from Social security. To tell the truth I lost faith prior to being approved ny Social Security. So after being rejected be th South Carolina Retirement System. I felt I had any choice but withdraw my contributions so me and my family could pay our bills. Here is my problem; the Standard wants approximately $8000 back from me. Their reason is that I am receiving a monthly benefit from the South Carolina Retitement System. I am not. I was disapproved for disability by the South Carolina Retirement system… so, I feel the fact I withdrew my contributions after being denied, I have every right to withdraw my own funds. What can I do to avoid having to pay the Standard? I feel I did everything required of me… so I don’t owe them any of my South Carolina Retirement funds… please help me understand. I just do not have that amount of money to senc o the Standard, especially since I feel I should not owe it.