Bad Client Service

I booked a stay at Imvubu Lodge for 5 days. I then cancelled 1 day. They agreed to cancel and then said nothing( no info given about the 1 days money). 5 days or so later I asked if I can use the 1 days credit for meals at their restaurant, they agreed. I was not told how much is my credit, this is if they are giving me the full days amount or not. I was not told that the condition for this is for me to use the full amount at their restaurant . We ate twice at the restaurant 2 breakfast and 2 dinners and the food was not good. At one point the ribs were burnt, we then decided not to eat there anymore. We checked out on the 1st of Jan 2019. 5 days later I requested an invoice . On the invoice there was an item "room revenue " with an amount then on balance 0. I asked what is the room revenue item. I was told its a balance left which I can use on my next visit. I told them I don't know when will I visit or if will ever visit again. I requested the credit balance to be refunded to me. Then they told me I was supposed to have used the full amount, but I was not told that. Also they then sent me their cancellation policy. Why agree to credit and even use the credit then when I query the balance Im told about the policy?. Why was I not given the conditions of the credit on arrival so that I can use it all? When I asked why did I have to request my invoice 6 days later I was told its because I checked out before their office open. But they have my email address and they received the keys from the security.?