I have two lovely DD's. DD1 is 4yo and DD2 is 2.5yo.
Mostly they are lovely, nice, kind etc. Then at other times they drive me insane. They do this thing where they say 'mummy' to get my attention, I answer them, then they ignore me. Sometimes they will ignore me completely other times they will leave it a few seconds and say 'mummy' again and ignore me again once I have answered them. DD2 especially does this several times a day over and over again, until I can take no more and have to remove either myself or her from the room so I can calm down.
IT IS DOING MY NUT IN!!!!
It is like a red mist descends and I feel all unreasonable. I want to shout and scream, I sometimes do

I have tried ignoring, reasoning with DD1 (DD2 doesn't understand reasoning much, yet), rewarding, praising when they do speak to me, telling them both that I wont answer them if they say 'mummy' again without actually telling me what they want/need etc.
It makes me cry, I cannot stand it. I am sick to fucking death of hearing my own fucking voice.