TRAVELSTART - UNCONTACTABLE BY PHONE AND DON'T ANSWER EMAILS

In the past I've been wary of online travel sites as I had the impression that they don't all have the resources to deal with queries or offer assistance. I wish I'd researched TravelStart on HelloPeter before I made the booking. They do not respond to emails, the telephone just rings and then cuts off. I've been trying to contact them for three days (emails and telephone) without success. If I needed urgent assistance with a booking, they would not be able to supply it in time. Eventually I gave up and contacted the airline (Kulula) directly - instant service. In future I'll use https://matrix.itasoftware.com/ to give me the airline and price details, and then book direct with the airlines, and avoid online travel agents.