Отвратительно Disgusting

I paid for the room through booking 10 days before arrival. When I arrived, I was asked at the reception, "Oh, why didn't they warn you? Your number is still busy, he lives there now, the guest who got drunk and does not leave the room should have dialed you. " Of course, no one warned me about this. They offered to move into another room, which looked like an apartment from the nineties with terrible old furniture and a dirty bathroom. I refused to check into this room. The room I paid for was the most expensive and they couldn't offer me anything better.
As an alternative, after much deliberation, the hotel employee, who did not really apologize, but was always mumbling something under her breath, suggested! Attention! stay in another hotel! That is, I pay for the room in advance, I arrive, and they tell me "the room is busy, you are going to another hotel"! As a result, we were settled in two different rooms (we had a company of three people and we planned to live in one room). I set the condition that in this case, let me return 50% of what I paid. For some reason, the hotel employee decided that she could bargain with me in this situation and said that she would only make a 30% discount. I didn’t have the strength to swear, because I was driving from Kyiv and we agreed on 30%. After an hour of negotiations.
When I checked out, I asked the reception for confirmation that they had returned 30% to me, they gave me a check on which the amount was less than 30% and said that the hotel employee with whom I agreed, and who, of course, was not on shift and of course it was impossible to get through to her, she promised a discount, I quote: "almost 30%"! Have you ever seen a promotion or discount "almost"? I told about what agreements I actually had with this employee, and they answer me "somewhere was it written down what the employee promised you? " That is, I still needed a receipt not to take?

I did not want to be there anymore and left, saying that I would wait for a call from them about the amount of the refund.
An hour later, I got a call, sort of like a hotel manager, wildly apologizing for such an unacceptable situation and promising to sort everything out.
It's been 5 days since then, I got back "almost 30%" and of course no one called back.
I did not think that this could happen in a hotel that positions itself as a premium. And in any other hotel it would be unacceptable.