Frankly Khandro I don't know why you get them, but I must assume there is some revenue generate from them. It is possible that you have a virus/rogue add-on which is replace ads as you go about the web. For example, when you do a Google search, do you get image adverts in the results?
I have found your Reckitt Benckiser ads Baldric. These were on the Topic/Category page for Chatterbank - which has a different source for the square ads.
When reporting ads in the future please paste the url you saw the ad on - that will probably speed things up.
I've written to the supplier to sort out those and to see what we can do about blocking them in the future.