They also will take a look at your CV in the OD, it is important to have expereience in cutomer services, but do not lie in your cv or resume because they ask you to bring to doha certificates or reference letters of previous employers as a proof.
Keep trying: it is an advantage now that you have the experience of an Open Day, you are much better prepared now for the next opportunity!
Cheers and good luck
Hey Usagi, best luck for you too, I bet you are very nervous waiting for an aswer!!!
Oh and I´m 28 and I did it!!