Service Failure

I have been trying to sort out something with regards to my upcoming flight, and every time I call in, I get told to contact the agent that is assisting me. That's all good and well, but they don't respond to me on email or call. Numerous times I have called and emailed, and still no reply. It has been infuriating, and the agents have been border line line rude, some of them. When I get to airport this week, I'll just put up what ever the issue is, but make no mistake, if I can, I will avoid using flight center again, and rather just book it myself online or which other option I choose to use.