Kesari Tours — Kesari not refunding booked money and Asking extra money

I Ms.Anjali V Sonpethkar, A handicap person of 48 years Booked tour NK2506P3 - LEH LADAKH on 25th June 2023 Pune Airport to Pune Airport with Kesari Tours PVT LTD Pune FC road office. Booking Date : April 11, 2023 ById : AJINKYA - ( P2 )
Departure Date : June 25, 2023 - July 1, 2023. I have paid Rs 128100 by cheque on 11th April 2023. On 21-May-2021 they are called and told that the flights they booked with Go first Airlines are cancelled and they will do refresh booking with indigo flights and need to pay 51000 per head means 102000 for two person. They are not doing any written communication. They have not taken my concern before booking flights. Now I am not having any money to pay. so asked them complete refund. But they are not answering me. Please I also sent mail I would like to inform you that as a handicap and single lady, I will not be able to pay extra money but no answer given. Please help me to get my refund back