Horrible service Travelstart

I booked an airline ticket for 22 October to 26 October 2020 from Cape Town to Mthatha. I used their website and could see every ticket had a JHB stopover. On confirmation I noticed that the return date was extended to 27 October with an unspecified sleepover in JHB. I immediately queried this and was told this was the flight I chose as others were fully booked. I told them I have used their agents before and none have worked outside the stipulated dates. They never refunded me. I had to buy another return ticket via the airline. They advised me to book directly with them next time. Their number in CPT is never answered. Horrible service