income support overpayment

Hello i was wondering if anyone could help me, i recently had a letter from income support saying that they owed me an overpayment, when i phoned they told me that they had taken £360 7 years ago that they were not entitled to because i was declared bankrupt at the time, they are now ( 7 years later) going to pay me that back.

Would anyone know if i am within my rights to also ask for interest to be put on top of the £360

Kind regards

Kirstie