Zero response from Travelstart !

I made a booking with Travelstart to fly to London via Qatar in November last year. Then due to Omicron Covid flight had to be changed. I emailed this fact about 12 days ago but received a response that they were only dealing with urgent cases of 24 to 48 hours prior to departure. I have now been trying REPEATEDLY for the past 2 days to get some kind of response either by email or their chat robot. NO SUCH LUCK !!! My flight is tomorrow. Why can one not talk to an actual human being at some stage??? Come on Travelstart; I have used you many times in the past with excellent service. What has happened???