That's quite a litany of apparent ticketing woes.
If I understand this correctly, you are on the west coast of the US and trying to return to your home country (somewhere in SE Asia/Asia)?
You have purchased three tickets - from three different outlets/vendors (cheapoair, EVAair and China Airlines)?
You have not been able to depart because the flight(s) were over-booked and/or the airline couldn't find your information?
You have not been able to reach any of the airlines/OTA (online travel agency - i.e. cheapoair) by telephone or website?
Have you had any refunds for the tickets you haven't been able to use?
If you had to purchase three different tickets and are staying three weeks past your scheduled return, are you having some financial issues?
What have you done about getting a flight back to your country ... go the airport each day for three weeks and been turned back each time?
I think you need to provide more information if you want people to help ...
In my book, something doesn't quite add up.