Might lose my tickets if Travel Start stops ignoring me and cancels them.

My flight is booked for 23 March. I requested a flight change on the 10th. After I received a very expensive quotation for the flight differences (I was not liable for change fees), I researched and found out that the airline will allow cancellations and provide vouchers for travel in the future. This is something that the travel agent should know, if I have to do all the research I don't know what value they provide.

I asked for the ticket to be canceled on 12 March. I received no response. I have sent 6 emails to all of the available email addresses that have not been responded to. It is impossible to get through by phone. Only the Twitter account responds. As of 20 March, my flight has still not been cancelled and the flight prices of my new dates continue to change.