Income Tax refund

Hi

Our IT refunds are pending with AO for 2 AYs. For one of the year, rectification order was passed, but refund has not been issued to the banker. For other, refund cheque could not be delivered to us, and now we have made a reissue request. Both these refunds are stuck for past 5 months. AO is not releasing refund orders to the bank. He closed all the grievances stating refund will be issues in due course.

Do we have recourse to any higher authority. Where can we raise our concern against AO.