Refund of Income Tax

Our company merged in a new company with different PAN. The refund receivable related to pre-merger period for an Assessment year was failed as the bank account provided at the time of return filing doesn't exist right now at the time of refund. We cannot pre validate a new bank account as there is no bank account with old PAN as the company is not in existance. We talked to AO and even CPC Bangalore but not getting any solution. How can we proceed with the refund.