Aha Taxis — They didn't process my refund

I had booked at taxi on 28.11.2020 on Aha taxis. They cancelled it. They said they'll refund the amount. Today it's 16.03.2021 and yet they didn't process my refund and show meagre response when communicated. I've been calling them on phone and mailing them and I never got a satisfactory reply.
Once they even shared an image showing that the refund is successful. Obviously not!
Many such things happened and finally I got to know that my refund has actually been failed and these aha people are not even answering my calls since then. I've dropped some mails for which I didn't get any reply.

Please help me.