help- tax credit overpayment! Dont understand their gobbledegook!!!

pennypinchingpenguin

i have previously been on incapacity benefit for 5 years until last august when i began a 6 month contract on future jobs fund. My IB advisor helped me fill in forms for tax credits. I didnt think id get anything but i was awarded £100 per week. I thought this was a lot and i remember i specifically called them from my work place (im now full time there) to check but they told me it was absolutely correct. I had no further contact with them until i notified them of the end of my contract. I got my last payment in May. Im now in full time employment & have not recieved tax credits since. All of a sudden i owe them £660!!! I had no changes through out my claim and notified them of my end of contract. Will i have to pay this? Im still a little confused by the advise offered on the main site. Thanks everyone! X