Stranded with my international flight with no assistance from Travelstart

Booking ***. Worst experience ever. I was stranded at the airport trying to call for emergency change to the booking. I did not have a transit visa for one of my connections and I had to make emergency changes to the booking (alternative route that doesn't require a transit visa) as I was flying out the same day. I called them and for over 50 min but no answer, used the whatsapp services and did not get any help. I have even used the contact sheet before but I have not received the help I needed. I ended up missing my flight and still no one is assisting. Even now I keep on trying to get assistance but no one is available....I have lost my flight, accommodation and other travel related costs and the Travelstart seems unbothered. Seems like after booking for your flights, I am really heart broken. My Shengen visa is expiring early June and I suspect I will still not be assisted by travelstart.