KFC AND FAULTY DRINK MACHINES

I personally like KFC but I don't understand how they can increase their meal prices for a larger coldrink when their drinks machine is out order, but can't decrease the meal amount if I opt do no drink at all (Due to their faulty machine). What was weird is that that branch just got renovated but the same problem of that machine is still there? How? Also, what I didn't like is that the tellers are now comfortable to just add on the extra money and I only saw when I was about to had to pay via card and questioned the higher price... Really not happy with this