Deposit/Monies to pay

I am an existing patient from 2007. He did three operations on me. Never had any non-payment issues, nothing. To see him now, I suddenly have to pay R900. When his receptionist called to confirm, I explained that I do not have that amount to pay now, my husband is a pensioner. She just bluntly cancelled the appointment with not even trying to assist us. I am extremely dissappointed. So what now? Neurologists don't easily work on each others previous operations done.