Travelstart Online Booking - shocking aftersales serice, beware

I have had the most frustrating and difficult time using Travelstart. I book a flight, no problem. Then the Airline, Turkish Airlines in this case, changed the flight, bring it forward by 24 hours. No problem. The second leg connecting flight, did not change. Meaning the two travellers would be stuck in the airport for more than 24 hours. I tried to contact someone via the Travelstart Website. Tried to call 10 to 20 times, no answer and reffered to the Whatapp line, no joy. Even though the system said they would get a consultant to call. I then logged probably 20 messages on the website. Still no answer. We are into the second week.....silence. I then tracked down the owner Stephan Ekbergh who resides in Cape Town and sent a plea mail.....no response...48 hours later. Please be aware that there is no way to talk to a human, how this is possible is crazy. I have now tried to logg a call to book a new flight asking that a consultant calls. I wait in hope for a consultant to call. Anyone who can advise how to get someone from Travelstart to engage. Please mail me on *** The service took my booking but the Travelstart service levels are shocking, no existing and pathetic. Be careful if you use this service, any changes are impossible.