Unwilling to provide treatment

My medical aid MSA for the year is up. I have a special needs child and a diabetic wife so this never lasts the year. I now have a broken tooth, which broke after losing a filling. I was waiting for the end of the month to go and see the dentist before the tooth broke. This morning I called the Kenilworth Medicross and asked whether or not I could see the dentist and pay at the end of the month. I was called back and told that this was not possible and that I would have to pay on the day. What am I supposed to do now? I am at least lucky, in a way, that there is currently no pain. This could always change. How is this helping your patients? This is shocking. Bearing in mind that I was one of the first patients to use this MediCross clinic after it opened when I went to see Dr. Wellington. I have used both the medical and dental facilities for years. Is this the way you want to treat your patients?