Worse service ever

I wanted to change my ticket of Monday the 3rd to today the 1st. I waited for Travelstart to reply to me. It has already been more than 48 hours. I had to book another flight ticket. That is not acceptable at all. Travelstart must give me a refund. I have never in my life experienced such bad customer service. Better just to book directly with the flight company. It is cheaper. And we can manage our own booking. We book through travel start to make things more convenient, but it ended up being more inconvenient. Very bad customer service.