There is no rule against camping spawn.  There is a rule attempting to do objectives.  Admins differ on time settings, but it comes down to whether the person had enough time to complete the objective or was trying to complete the objective.  If a T is camping T spawn and the bomb has been planted he still could be doing the objective because he is covering 3 possible avenues towards B and two avenues towards A.  Most of the time it is situational judgement.

If you are accusing another player in alltalk of hacking, then:
a.  You aren't too bright because you have notified the possible hacker
b.  The best way to report is to team chat "@ msg"

If you continue to harass the admin and they ask you to stop don't be surprised if you are silenced or kicked.  Excessive hack accusations could be considered trolling either the suspect player, the admin, or both.  There is more than one way to observe a hacker; rather then the obvious going to spectate.  So, if the admin acknowledges your claim let it be.  You are more than welcome to time log by typing "thetime" in console or demo yourself.  You do not have the right to dictate how we observe hackers and be upset if we don't jump to your beckon call.  We have many ways to observe hackers so do the right thing and notify us.  Still, feel unsatisfied then demo the hacker and report in forums. 

For example, if you would accuse someone of hacking and continue to spam the hack accusation and pester me about not doing my job I would have warned you to stop trolling/spamming.  If you continued I would have silenced for 1-map.