i am not using auto clicker in ladder slaher but it auto clicks by itself?!?

You need to "Disable" it

i never downloaded auto clicker but it is auto clicking for me?

Press "ESC", then click the box to "Disable Auto Click"

so why does game say if you auto clicker you will be banned from the ladder slasher but it gives option to use auto click?

So... did you do what I stated?
Did it NOT work?

As for the "bot" blah, just don't worry about what have been approved in the game... if you want to "Auto click" then don't tick the box... if you want to "Disable" it... then click the box.

I know it is frustrating, but, if you are not botting or using other programs you are safe.

the game states that "***WARNING: If you cheat(bot, macro, auto clicker etc), you will be banned from ladder slasher and d2jsp. ***
but game gives option to use auto click.

Using any outside programs will get you a ban.
The inbuilt mechanics of the game are not an issue.
They do not bypass afk timers or auto click new monsters.

What? is there a auto clicking function in LS?
Do you mean auto as in you can hold down the mouse button?

Click on a mob once and it stack that mob until it dies. That is the only “auto clicker”
Auto clicker that would be not allowed is if something starts attacking a new mob for you.