Tata Motors — Late delivery of Tata Altroz XZ

I had booked Tata Altroz XZ variant on 25th January 2020 and they said I would get it in 5-7 weeks .They assured me that I would get it by my birthday i.e on 21st march .It's 31st March and I haven't received any confirmation about the delivery of car .Tata motors dealers are playing a dirty game of fake promises to customers. No one is there to listen to any sort of complain .I have already complained to customer care representative regarding the same but there is no response from the regional team as well. To whom shall I complain now ?