Hello @Baylar_Ismayil
Do you mean that you could still access it even though ActiveSync is disabled?(reference only. )
How long ago did you disable ActiveSync? There may be a delay, try changing your password if possible and it should block access immediately.
Is your device quarantined? you could also take a look at device access rules.
(Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.)
Hope this helps!
Regards
SF