Indigo Airlines — Flight overbooked

I had a booked a flight (6E 2403, 6E 317) from Delhi to Mangalore with a layover at Bangalore for the day 6/12/2022 and the flight departure was at 0700 hrs. I had booked 9 days prior to the departure day. I woke up at 3:30, kept trying to book a cab for like one hour and paid 600 rupees to get to the airport but when I was finally checking in baggage, they were delaying it and started discussing among themselves and asked me if I would like a direct flight to Mangalore from Delhi (6E 6303) at 1415 hrs. I was confused as to why are they asking me this l, so asked the lady why. Apparently indigo had overbooked the first flight of my journey and some international flight had landed and some of its passengers were headed to Bangalore. There were more o[censored]s who were asked to change our flights. I gave it a thought but refused because I had like 8 more hours to wait if I were to say yes and I was asked a day before or even few more hours earlier before I booked a cab, then happily would have agreed and left for the airport at appropriate time and took the metro to save money as I only had one trolley bag and a tote. But then she replied that there are no seats. She promised me free meal and vouchers. It was a 3 hour flight to Mangalore so I didnt get hungry and nor did they offer any meal to me. Earlier when I had booked my flight there were no direct flights to Mangalore. I don't care for that but the vouchers that she spoke about are nowhere to be seen. I have travelled quite a bit this year with indigo but this is the second inconvenience they have dawned me with. Earlier in July, my connecting flight from Delhi to Udaipur got cancelled and had skip my sleep for that night as my flight was in the evening the next day. I have checked my mail and the indigo account but can't seem to find those vouchers.