Travelstart and CEM Air

I bought a return ticket via Travelstart. The return flight was with CEM Air. Firstly, I will never ever fly CEM Air again. Beware their aircraft. They use small propeller aircraft and the one they put us was late because of technical issues. While taking off the pilot suddenly slowed down and turned around due to the same technical issue. They offloaded all passengers and we were taken back to the airport. They were unable to give us any indication as to what the status was and how long we would be delayed. People were infuriated. They missed connecting flights, meetings, etc and this airline was non-chalant. They offered refunds to us. This was 5 days ago. I keep being pushed from pillar to post by Travelstart and CEM Air. They have not communicated to us regarding refunds. When I called Travelstart customer service, the lady who assisted was full of attitude and argumentative. Basically saying that they contacted the airline and that I just have to wait until they hear back from them which could be never. My advice to you is do not use Travelstart or CEM Air.