Banks did it the right way for easy tax purposes. First when I look at my holdings, I was confused too, because my cost on book was showing 10k different. Later I checked it in detail and noticed the following.
1) They closed the Apha with cost at the time of adjustment. That means, on paper your Apha share will show as sold.
2) The total amount from the above proceedings is now shown as the cost for the 838 Tlry shares (if you were having 1000 Apha shares).
So, there is no net loss or gain (except for a loss of 0.1 share in the adjustment of 1000 shares).
Be happy guys.... this one is going to rock going forward!