Shocking Service from City to City

The most disgusting customer service. They do not answer their phones. If they do the people can barely speak English and have such a bad attitude. I needed to make a change on my booking which I need to pay for by EFT for which I need an invoice and proof of banking details. It has taken them 4 days to send that to me and it is incorrect. I am more than likely going to have to book an entirely new ticket. There is no answer on the customer care line nor is there anyone in the 'complaints' department at all. They give you numbers that noone answers. The only person who helped me at all is Billy however if he is not there then noone can assist and he leaves at 13h00 every day.