I must not have been clear. I added a lot for clarity, but that apparently backfired.
I made no change with BA. I asked no one for any changes. I didn't want any changes. That is the whole point. I didn't want to call BA, but I had to purchase seat assignments, as everyone who buys biz class with BA must do. That is the only outgoing call I made.
Also, there was no "offer" to make a change. It was done without my knowledge or approval. Then after it was done, I was forced to pay more.