"But I told you!"
Yes dear, but where was I?
The answer is that I wasn't in the same room, she was muttering to her laptop, and I still don't know what she was on about.
I expect I have agreed to something.
I hope it won't be too painful.
Sorted that one out a while ago, in reply to one of her “I told you” explosions, I replied with: “You didn’t tell me when I was listening.”
My son picked up on that and it became his excuse of choice when berated for not doing something.
Now, anything relatively important gets a verbal confirmation that the instruction has indeed been received and understood or the excuse gets trotted out once again.