@linerider: I think I will call them tomorrow morning. Sunday it's a usual working day in Qatar, isn't it? I just don't want to be misunderstood or something, you know ...
Yes, Sunday is a normal working day in Qatar. I know what you mean about being misunderstood, but as long as you are polite, there is no need to worry. I know lots of people who have done this (as did I, several years ago).
Phone the switchboard number for Qatar Airways Tower in Doha, then ask to be put through to HR. The number can be found on the Qatar Airways website under Contact Us, then select the details for Qatar and Main Office.