Icici Direct — GMR IPO allocation not yet allocated after over 3 years

I had applied for GMR infrastructure (GMRINF) and got allocation notice over 3 years back. I could not see the allocation in my icicidirect demat account. Several complaints were lodged with icicidirect, only emails going back and forth but no real progress, here's the history:
Initially they said it has not been allocated by registrar,
when complained with registrar, I got a mail that it's allocated by registrar and icicidirect acknowledged
then ICICIdirect said it's technical error and will be allocated in my account but still not yet done

Not sure whom to go now after several vain attempts with icicidirect