If customer is entitled to interest and bank has delayed the payment despite your representations/is deficient, you may stake a claim on interest/compensation for the delayed period. Bank may offer to compensate as per its Compensation policy.
However while you draft your representations refer to the brochure T&C, your compliance to the T&C, your entitlement, deficiency and lapse on part of the bank and raise specific demand{s} including for interest.
If you are entitled for interst that is your right and bank is under obligation to pay it.
BM and bank may be wary of or suspicious that on making of the payment of the interest you may still demand compensation.
If you have demanded interest and refund of genuine and reasonbale expenses incured on justling between authorities, making representations, phone calls, writing emails etc bank may agree. Bank may ask to give a letter that matter stands closed.
If the offer is not made, or bank declines you have a reason to move to DCDRF.
Valuable advice of learned experts/members is sought.