Bad Customer Service at Bella Donna Clinic (hair salon)

Just to let everyone know this is for the hairdresser opposite Red Cross Hospital, the manager is Tasneem. I had an appointment for a Black friday special for a botox. I made my appointment for Marencia (the stylist) for 4.30 Friday 29th November. At 4.20 I receive a call from Gakeema advising me that Marencia is not in, I then ask if I could change my appointment for the Saturday and she advised that Marencia is fully booked. I then ask Gakeema if I could come next Friday the 6th Dec and she said it should'nt be a problem but she would have to ok it with the manager. I then sent a whatsapp to Tasneem on the Sat 30th Nov and now comes the problems. Tasneem then refuses to let me have the black friday special for the 6th dec because it was only a black friday special. What I cannot understand is, they were quite happy to attend to the clients on the Saturday with the special because Marencia was not in on the actual black friday. This is the response from Tasneem ''''No you should have just come for your appointment. I'm not aware what Gakeema said to you.. If you had informed me instead of threatening me I would have gladly kept Gakeema's word. I take offence to your threats."' All I said was that when I am happy with customer service, I normally like everyone to know on Hello Peter and also when I receive bad service I like everyone to know. I don't threaten, I just state facts, I am just a client that deserves customer service which really is lacking in this day and age. This manager is very unprofressional. Her staff gives much better customer service......