Makemytrip - Make My Trip Credit note not fullfiled

I had booked a holiday package (Booking ID - NH**************) from MMT but we were unable to aboard the flight beacuse of an unexpected passport issue, meanwhile although we requested for a refund. They did not agree stating that it is a non refundable package. However a credit note has been given from MMT mentioning that we can reschedule our holiday anytime before October **st **** since the refund cannot be escalated. Hence we came up with a alternative date and provided the details on the same. Unfortunatley there is no solution or positive response received from Make My Trip. They have been extending for quite a bit now and seems like they have been taking advantage of us being patient towards the issue. We paid about *.** Lakhs for the holiday package and would really expect refund for the same. Alternatively, We are no more interested in travelling with Make My Trip in future. Heavily dissapointed with their response in providing customer care service and misleading us with a fake Credit note . Please help us with the refund.