Bad service from Capitec

Well today i had a Special Doctors appointment which i have been waiting for the past few months as i am terribly sick and need urgent health care due my respiratory system not functioning properly. The cost of the Drs appoint is the amount R x....... . This morning i woke up and a received a notification that a certain amount of money was deducted from my account R y......... . Now i do not have the money available to pay for my Doctors appointment due to the fact that money was deducted. I however contacted the branch and they indicated that it is a system error in which payments was deducted twice and they are in the process to resolve it. This is so unfortunately that i do not have money to pay the Drs Consultation due to the system error done by Capitec i contacted the Drs surgery and i will only be able to see the Dr in 2021. What an inconvenience i am considering changing banks.