Shocking customer service from travelstart

I have tried every possible communication avenue to try make a change to a flight booking but nothing works. There is no active call centre just a whatsapp line which they don't reply to. I've emailed, posted on Facebook, direct messaged, messaged on their flapp app. Nothing gets through. I need to change a booking urgently or risk lising my accomodation deposit and in the mean time the flight prices on new dates keep increasing which will be for my expense but it is their fault for not getting back to me! My booking reference is: TDKP5Q on airseychelles (through travelstart online booking site ZA***2)

Travelers: Tracey Strydom Clint Strydom Troy Strydom Benjamin Strydom

I would like to change these flights to the following dates: 29 December 2021 ex JHB to MAHE to 24 March 2022 6 Jan 2022 ex MAHE to JHB to 1 April 2022.

Please advise as we are needing to rearrange our accommodation urgently in order to avoid cancelation penalties.

Many thanks Tracey