Shocking service and assistance.

I was meant to travel back to Bahrain on the 18 July. On the 17 July we had a death in the family so I changed my flight to leave SA on the 24th July. I made the change and paid the airline the additional fees on the 17th July. I did not receive an email for the change so I called the call centre. I gave them my email address and they said it says I was returning on the 24th July but they cannot find me anywhere on the system and I must wait for a supervisor to call or book another flight and pay the full fair. This is unacceptable. I have paid for something I don't have.