STOP touching my BR tags!!

Why is WP ripping out my
tags and replacing them with <p></p> tags?

I have margins set on my P tags, I do not want them, please leave my code alone!

I have installed advanced editor to stop you hiding them from view, I have also installed a plug in that says its stops this but it does not work.

Why give us the HTML editor and then not trust us??

seriously annoyed now.