Extremely disappointed, my son's birthday ruined

I booked and paid for a bounce session for my son's 10th birthday tomorrow at bounce cornubia a few days ago, confirmed booking. Today I get a call from them to advise they have no socks in our size available and that my session has to be canceled. My son was looking forward to this for his birthday morning, I took off from work to ensure we had the day well spent. This is a ********* way of running your business amidst the times we already living in, once would think over a school holiday there would be sufficient stock of sock sizes? I am extremely disappointed and I not to mention when I had to break the news to my son.