i've got my team ready to kill some of those powerful wizards for loot and experience but they won't come to me. i tried to use a shield spell from Jan in docks and only 1 of them comes and warns me. but if i do spells after that in docks, promenade, slums they won't come to fight me. why they don't come? i have 3 mages all with breach spells and the secret word etc. is it because i'm only on day 6? i have to wait longer until they attack me? because i don't want to attack innocents and make people hostile - i'm playing a lawful good character

No idea. Never had such problem.
BTW, to deal with Cowled Ones you need only Jaheira with summon insects spell (level 5).
I never pay 5000 gp's for license (don't forget about precious loot and XP and high-level spell scrolls you get!). :D

Baldur's Gate specific forum is one of the most active of all game tforums here so there no need to post it here.

ok man i posted there too but nobody talk to me. yes i have Jaheira with insect swarm, i also have Aerie with vecna robe to decrease casting speed and Yoshimo for backstabs and traps

I haven't played BG2 for long, and the last time i played it heavily modded, but they should come rather quickly if you start casting spells after the warning. Btw BG2 is just made for soloing imho. Robe of Vecna + Amulet of Power + Time Stop + Improved Alacrity = I WIN.

I love fighting with them as well, I think you need to change screens after the warning, but not sure, I too remember problems with getting them to appear