You still have to surrender your Indian passport within 3 months to avoid getting prosecuted. This process also includes a visit to their embassy, giving them

You still have to surrender your Indian passport within 3 months to avoid getting prosecuted. This process also includes a visit to their embassy, giving them your original naturalisation certificate and photocopies of your new passport. Takes about a month to receive a certificate from India for proof but definitely not as bad as what you described.