Why an appointment when u don't stick to time!

I'm always early or on time for my sorbet appointments. But am always made to wait sometimes 5 to 20 mins. Sorbet dainfern drybar. I always brush it off because I enjoy the nail therapy treatments by wonderful ladies like Amanda and Jennifer. 12th of Dec (confirm on the system) I waited over 20 mins to start my pedicure. On the 22nd of December I had an appointment at 07:30 but the the****** was not there for my buff and paint. The admin lady said I can come later at 5pm for express mani to make up for the error. At 5pm I did go but they did a normal buff and paint cause the the****** had another client at 17:30. So much for making up for that. Anyway again brushed it off cause didn't want to insist on them keeping their promise. But today I had enough. I booked an appointment for my mum to spoil her. As she is from Dubai for the Christmas holiday. I booked a medi pedi and a full manicure for 9am sharp. I dropped off my mum at sorbet at 08:50. And they kept her waiting for over 30 minutes. She sat there waiting and no one told her that the the****** called in sick! I can brush off myself waiting and getting doped for make up sessions. But that's my mum! Admin sucks! Unprofessional!