When I logged into 'manage my booking' after making the flight change the first thing in front of me was a request to input my email address confirming my refund. I at no time requested nor cancelled the booking.
I called BA at 07:30 London time and was put through to a man in Cape Town. He was actually helpful unlike the lot the night before. He said to me he has seen this once before and that he isn't able to assist but did point me in the direction of customer service. Again unlike the lot the night before.
My partner was sitting next to me when I logged in to make the seat changes and I noted to her how 'odd this looks about a refund'. She will testify to that.
The person who made the first changes did tell me he would make some changes for me within the booking and I need to not be in it for 5 mins. I suspect HE cancelled the booking.