No person to contact for help

I travel a lot and thus make use of online travel agencies to book flights. Travelstart was the one I used most frequently up until I had to change my bookings one Sunday evening. Travel start does not have a direct line to contact them should you have queries or need to change your flights. I fell sick on a Sunday evening and had an early flight out the Monday morning. I spend most of Sunday evening struggling to get hold of someone to assist me over their Whatsapp line and their contact portal on their website. I finally got a response after I was send a message to say I should contact them during office hours. This was just after 7pm Sunday evening. According to their website their Whatsapp line is active until 8:40pm Monday to Sunday. I was told that because I was already checked I cannot cancel the flight. This was not a problem as I wanted to move the flights to Tuesday same time departure and return. I received an email at 7:39 Monday morning explaining to me the procedure to follow to move the flights to Tuesday morning and afternoon. I had a cut off time of 11:30 Monday morning to confirm this which I did on the Whatsapp line as well as the web portal. I only got a response by 11: 40am which in my mind was to late according to their earlier email. The end of this story was that I booked flights for Tuesday through another agency ending up loosing my money for the flights booked through Travelstart because I could not speak to someone directly and getting help timeously. I will never use them again; all other agencies and airlines have direct lines of communication. I have changed my flights on the day of travel to an earlier flight through the airline. In this case the airline could not assist me as I did the booking through an agency.