"Poor service"

I was 10 minutes late for a blood test appointment and was prepared to wait to be seen. I explained to the receptionist that I had forgotten my mask when they asked me to account for my tardiness. They barked "Sit over there & wait to be called." No please or thank you. Next thing I'm being told I can't be seen that day as the nurse is too busy (this was in a waiting room that was empty bar me). I said "Please, I've been waiting for 3 weeks for this, I can wait but I need to be seen." I was told no, the next appointment in 2 weeks. I walked off in anger. This is an appalling way to treat a patient. To add some context, I've been at this practice for about 15 years with no previous complaints.