No Customer Care Whatsoever

After a nightmare experience on 9th November at Oliver Tambo, my sister and I sent emails to a number of relevant, published contacts on 11th November. To date there has been no response or acknowledgement. How is this possible? Emails were sent to *** and to General Manager *** and General Airport Management Centre *** and Manager Car Park *** and Manager Operations Coordination Amy. ***. Surely professional etiquette demands acknowledgement?