Disappointed in TRAVELSTART

I purchased an airline ticket through Travelstart. It is a 2-step journey. Although on the invoice it confirms the full journey, they have only sent the e-ticket for the 1st leg of the journey. I have called them 4 times today with the very first call being told they will call me back - never did. In fact just resent the e-ticket for the first leg of the journey. And still no response! My calls are now being dropped. What do I do?