Horrendous service

I booked a room in Emakhosini Boutique Hotel and Conference Center on Sunday afternoon via Agoda, a Booking.com affiliate. I specifically requested a double bed and a spacious room on my reservation. I also opted to pay on arrival and I did so using a debit card. The receptionist took me to a room that looked like a garden-shed that had 2 single beds joined together. I insisted on at least getting a bigger bed as per request made on my reservation but I was told none of the rooms have bigger beds. Aside from the fact that I was really tired and needed to rest, I was now really frustrated because it seemed as if no effort was made to prevent me from canceling my reservation at point in time. The receptionist told me that the hotel manager was unreachable on weekends when I requested a refund which was denied but she assured me that it will be processed the following morning. I emailed my banking details but up to this point I haven't received my refund. Whenever I call the hotel I'm either told that the manager hasn't opened her emails or busy in a meeting. The level of service that I've received is below any I have ever received on all my travels. I wouldn't recommend anyone to use this hotel.