ABSOLUTE WASTE OF MONEY WITH APPALLING CUSTOMER SERVICE!

If I had the option I would give Travelstart ZERO STARS. Absolutely appalled! My flight that I’m urgently needing to change leaves in just over 7 hours. I have been trying to contact Travelstart over the last week (via WhatsApp, via online contact form and email) to change my flight date, with no luck of receiving a reply. Now I have no choice but to miss my flight and lose my money. I will NEVER make use of your services again and I will make sure that no one in my friend circle makes use of your (useless) services. Anyone know where I can escalate this further?