Online cheats and Bots

[Askival]

Hi still a newbie at this game (but I have since bought Team Force Dagger 'cos I like DF" so much)
I play as Fluffy Bunny online and try to avoid SAW games but I have found a few curious things since starting online a few weeks ago.
1 - I appear to get shot through solid walls. Is this a bug or a cheat?
2 - One game (16 player deathmatch) I was dogged by one guy who seemed to home in on me all the time regardless of where I started. Is this a cheat or was he just good and/or I was hopeless.
3 - In a few games I seem to find guys who run around with knives and I can't seem to kill them despite them running headlong into burst fire. Cheat or am I just a bad shot?

Assuming that I am not hopeless at this games, are there any cheat-free servers?

Regards

Fluffy Bunny