Can't transfer shares from one demat to another

I have completed the entire process on the CDSL website for transfer of shares off market from GROWW to Zerodha but despite submitting and verifying my transaction, the shares have not been debited. Grow customer care helpline is more or less useless as they take forever to respond and no one attends calls properly. If you have transferred shares from one demat to another, please help out. What could be the reason?