Unfortunately it seems to be a misunderstanding. The OP claims to have asked for the stock and action to be separated. It takes very little logic to see where that could lead to, if one were the perhaps not entirely clued-up seller.
One must put this down to experience.
Personally when trying to get a message across I go to extreme measures to ensure that I am not misunderstood and conversely I rapidly get frustrated being on the receiving end of ambiguous ones.
Reminds me of a car boot sale find of a near mint boxed 50s toy car, I asked the price, confirmed the purchase, and as I was being handed the item the plonker went ahead and scribbled the price on the box.