No Call centre response

I booked two return tickets to Cape Town. As I am a special needs passenger, according to the Terms and conditions, I tried phoning the call centre. Just not working. I chose the option to pay within 24 hours as it told me I can pay ny usinlg the \manage my ticket"option -- well there is no option like thtat on their web site. Sent a message to the call centre using the online contact page -- no response. """