Bad service, website problems and over pricing

I booked a flight using the website. The website defaulted to original settings so my flight was booked return to the wrong city. I immediately tried to change online but was not allowed to because one leg was a BA ticket. I spoke to Anna who was lovely and tried to assist by wavering the change fee, but then the call cut. I then spoke to Biana Manuel who ticketed all the boxes but was useless! She tried to change my ticket but the price she quoted to change was MORE THAN the cost of a new ticket?!?! She could not explain why it was more, she just said it was the taxes, whilst on the call to her I tried to book another ticket and the website did the same thing - it defaulted and took me to another cities flights SO NOT MY FAULT! Bianca honestly sounded like she didn't care at all and before I even had the chance to finish asking for her TL I was on hold - for a long time. When she got back to me she said her manager was not available, thanks Shana Liebenberg, and said to be honest 'I must just pay'. No help, no care, no love for a VERY LOYAL customer with a Kulula card and Travel Bank. How and when is it my problem if your website is faulty and why should I wait and pay more??