Paytm — Flight ticket booking

I booked a flight ticket on 12.sep.2020 (03.24 am) Mumbai to Kolkata air asia flight date and time is 17.oct.2020 saturday morning dep.- arri time (01.05 - .03.55) non stop flight. they cancelled my flight and reschedule into a one stop flight. the next flight time and date is 17.oct.2020 (5.50 am stopage on Bangaluru then Kolkata 4.55 pm).i booked a non stop flight and payed for that Rs-5, 740 the reschedule my flight to a stopage flight that is the reason i cancelled my ticket and claim Rs-5261 refund and cancellation charge is Rs-479.i waited 7 to 10 days but it was not done, then they shoes in the app that your refundable amount is Rs-1812 and it will be reflect on your account by 11.oct.2020 which is not done!!! and then i got an update that your refund is successful but i didn't get any amount i tried to call there customer services a lot of time they didn't take my call now i am hopeless i want my refund amount which is Rs-5261 please help me.