So much for having a medical aid

My debit order was sent back on the 5th of May. I was unaware of that. I received an email from Fedhealth on the 7th of May informing me about my outstanding payment. Within one hour I paid the premium into the account of Fedhealth. During the weekend of 8th May I was informed that my medical aid membership was cancelled. That came as a huge shock to me. There can be 100 reasons why a debit order did not go through. FEDHEALTH GIVE ME NO CHANCHE TO EXPLAIN. EVEN THE FACT THAT MY MEDICAL AID WAS PAID UP TO DATE ON THE 7th OF MAY , MADE NO DIFFERENTCE - THEY CANCELLED MY MEMBERSHIP.