"Isnt that being a tad naive and simplistic."
Not really - just realistic.
Why should you expect people who have better things to do to wipe your backsides merely because you don't feel you have the time to check the website for available dates? Hundreds if not thousands of people have managed it with similar work commitments, if you believe yourself to be a special case - raise it with LC.
Black and Brown - I have no interest in exchanges with you - I merely offer the observation that the seniority based system did not bother you until your application was rejected. I suggest you be positive and enjoy your current job as this obsession appears unhealthy.
Rgds