Called as told, then told I don't understand, like I am stupid

I called Warmbaths forever resorts on Tuesday evening to try and get accommodation for the weekend. I did know that I was taking a big chance due to this weekend being a long weekend, but I though there might have been a cancellation. When I called I was told that no accommodation was available but I can keep trying incase a cancellation pops up. The lady who assisted me on Tuesday was very polite and advised that the only way I might be able to find a place, is if I kept trying. She advised that the resort unfortunately would not be able to call me, if I cancellation popped up, that’s the reason I need to keep calling. I called on Wednesday the whole day about after 3 hours and still no cancellation. Today I called about 4 times already and an extremely arrogant lady, who picked up the phone each time I called was terribly rude, she tell me, “Mam, I have told you previously, we do not have any bookings please stop calling as the resort is fully booked, I explained that I was told to keep trying, then she just puts the phone down. Warmbaths has been our holiday destination for over 15 years, as this is the only place the kids enjoy going to, which can be checked by the resort. This is the first time I have ever received just bad horrible service from them, I did keep trying as I know from previous bookings that last minute cancellation do happen. I am so extremely disappointed in the attitude of this staff member. I would assume that being polite would be the first part of customer service, after all I just wanted to know if any space had come up. What horrible customer