What are the regulations and / or rules with Disabilty benefit(s) repayment?

I have worked full-time for approx. two years but during that period recieved Disabilty benefits. Humane Resource notified Social Sercurity that I was working full-time (twice) yet the benefits did not stop. Can Social Sercurity keep all future benefits until the re-payment is paid in full and / or take out 15% on a monthly basis?