Revision of return after refund payout

An  assessee filed his return (ITR 1) for a particular assessment year claiming for a refund (say 10,000). The return was processed under section 143(1) and the refund was duly paid out.

After this, the assessee again revised the return so filed claiming refund of a higher amount (say 22,000).

- Will he get the refund at all, since the return has been processed and refund paid out?

- If yes, will the refund be of Rs. 22,000 or the excess amount of Rs. 12,000 (22,000 - 10,000)?