Indigo Airlines — about not giving entry in flight 6e5003(19/10/2019) and discrimination faced in booking next flight 6e6612(20/10/2019)

(PNR No.FE9FGS) Myself Vaibhav Anand coming from coimbatore to lucknow connecting indigo flight(19/10/2019).At delhi, flight landed at T1 terminal.My connecting flight 6E5003 is from T3 terminal.
I am with my family, my father faced some medical issues, so i asked about T3 terminal from indigo staff counter.They told to wait there at T1 and said that airport bus will come and you easily reach there on time, but after some time when i asked again they said that now you have to book a cab and reach there on your own.Immediately i went outside of T1 terminal and booked a cab at rs.500 to reach to T3 terminal.Cab driver said that it took 45 minutes to reach to T3 terminal as due to heavy traffic.At that time it was 4pm.I am unknown about delhi terminals distance as i had never visited delhi airport and it was my 1st time.As my baggages are already checked in so i think that we can easily pickup the flight.I had reached to T3 terminal at 5pm.( and flight take off time is 5:30 pm)
In security check it was very crowded.So it took 10 minutes there.Also, my boarding pass had no mention about the gate no.Some how by seeing the display i came to know about my gate no.As 49.As i was unknown there, so i asked cisf staff about gate no.49.Some how i had reached there at 5:20pm.I requested indigo staff to get us entry but they refused to do so and asked me to collect my baggages from indigo counter.
After us, three four other passangers came of same flight, and they said that they gets delayed in security check.
Till now its ok.I had asked them to transfer my ticket to next flight(as i booked in flexi fare).I also requested and tell them about my father medical issues.
They said that you have to buy new tickets with full fare and flight is at 5:30am.I agreed, and pay them rs.12000 to buy tickets with same pnr.
In morning i met with these three four passangers who had missed the flight like us.They also came about 5 minutes late than us.I became very much disappointed when they tell me that indigo staff had transferred their ticket to morning flight 6e6612 free of cost.
I want to ask indigo authority why they do such discrimination.As they had missed the flight, we also missed the flight.I have my genuine reason also about my father medical problem and unknown about distance between two terminsls and also got misguided with indigo staff.(in my openion indigo should clearly mentioned about terminal distances, as i had visited many airports in which terminals are close by)
I am also attaching two of the customer's boarding pass( mr.Taukir bakshees ali & mr.Mohd shami FLIGHT NO.6E5003) and reservation details whose indigo staff had transferred ticket to morning flight(6E6612) free of cost BUT charged us(total four Family Members) Rs.12000.
I also attached my and my fafily members boarding pass and reservation details.
I am preferring indigo flight travelling for a long time and also recommended it to my friends and relatives due to good services, on time and affordable price.
But, after that incident I becomes very much disappointed due to such discrimination and misbehave & misguide by indigo staff present at Delhi Airport.
For indigo all boarded travelers should be same and should be given similar facilities.There should be no such discrimination thai i had faced at delhi airport.
I just want to ask Indigo's higher authority that why this discrimination?
That tour becomes pain full for us due to this incident.I except a quick reply from Indigo Authority about that issue.