Booking.com false advertising

They have an apartment advertised Beautiful apartment in century city, Cape Town. Firstly when we booked Booking.com advertised all ground floor apartments sold out. When we arrived we were given a filthy DUNGEON on ground floor in the backyard. No COVID19 PROTOCOL was in place in terms of the cleanliness of this DUNGEON we were given. ( I have pictures of this) I paid R1695. When I called the owner on Thursday, 14/01/2021 evening I was told Booking.com has the payment and I need to resolve my refund with Booking.com This morning I received a refund of R300 ??? Where is the rest of my money (R1395)