Make My Trip — No one from the head of department has gone through the pax concern

I had booked a tkt for 10 Jan BA 138 BOM - LHR, BA 285 LHR- SFO through make my trip before booking i had asked the travel agent name MR. Navi Hussain are the pax travelling to USA on tourist visa, travel agent said yes and he booked my tkt on 26th december . then after some days i had got message from BA that covid test is required before travelling so for confirmation of procedure i had called make my trip travel agent that time some other staff name shamshad told me that we are not accepting the booking for usa tourist visa who has booked your tkt i told navi hussain has booked for me then i had spoken with navi hussain but he told me that he is booking the tkt for same airline that is british airways and pax are travelling to usa on tourist visa . then on 10 jan when i reached the airport the airline staff told me that make my trip agent has booked wrong tkt for me and they have done cheating with you and they are fraud as per airline . now it was very important for me to travel to usa as my sister is not keeping well and it was a emergency situation i had to reach, from that day till now the travel agent has not arrange a tkt or refund for me as it was not my mistake it was staff error and blunder . make my trip should give me refund as its 5 days from now and i am still not reached at my destination . i had asked for manager to talk to me and i have also send an email still i haven't received any reply from their side . why if staff has done mistake why should pax suffer . make my trip should give me my refund why are they holding my refund they should arrange through their staff if staff has done mistake and give wrong information to the pax .
i am attaching tkt which was displayed on the time of booking on make my trip website which clearly states that they are accepting pax for usa tourist visa .