Agoda more expensive then hotel amd charged twice

I booked a room via Agoda and was charged. When I arrived at the property , they advised that no booking was received from Agoda and charged me again. I immediately called Agoda to refund me and am still awaiting the refund 3days later. Now they refuse to refund stating that the hotel must process a refund. They have kept me on hold waiting my airtime and expect me to call the hotel and request a refund after I had escalated the matter 3 days ago. They are charging and additional R300 for admin fees and expect clients to resolve their errors.