Agoda — Flight cancelled due to operation and not giving Refund

Booking id[protected]
I Booked Flight From Agoda From Phu Quoc To Da Nang On 2nd January Vietnam Airlines
Firstly The Flight Got Rescheduled To 35minutes Earlier
After That I Got Mail From Vietnam Airlines That VNA ADVISE SCHEDULE VN1740/02JAN WAS CANCELLED DUE TO OPERATION
That I Contact Agoda To Initiate My Refund Than They Told Me Travel Partner Refused To Give Refund
They Are Doing Fraud