Horrible drive through service from staff

I drove to this KFC branch tonight with my wife and my two year old daughter to buy food via the drive through and the service we received was absolutely terrible. I wanted to order 2 separate meals with two separate payments and was told it's not possible, in a polite manner I advised the teller that it is possible as I do it all the time, they asked us to drive to the window where we were supposed to make payment and I was told the same thing than I asked for the manager who ended up shutting the window and asking the cars behind me to reverse. We waited patiently for about 10 minutes with no help and ended up driving to KFC Terenure where we were assisted with our order and guess what... it wasn't an issue to make 2 separate payments as usual. I'm so disgusted and I hope upper level management is aware of the poor service in that branch.