Medicross Carlswald complete lack of service

Made a booking with the dentist Dr. Pieter van den Bergh 4 weeks in advance. Get phoned the day before the booking by his assistant to be told I cannot see him at the time I booked the following day and the only time available that he can see me is 9am that morning. But I have commitments and cannot see him when it suits him, I made a booking at a certain time for a reason. And his assistant wasn't at all helpful... in fact completely unhelpful and only to keen on just cancelling my booking which she ended up doing... because he had one time available and no other, which I couldn't make - so just cancel me and send me a message to tell me my appointment is cancelled. Well I will never use Medicross ever again for anything!!!! This is medicross Carlswald, Midrand.