shocking service

Waited 15 minutes on a teller. I eventually get to the teller and she leaves the cubicle saying I have to wait on the other teller. The other only tellers she is referring to is busy giving Deboinairs change and waitiing on an account numeber busy with this for the lst 10 minutes. The teller that left comes back no apology,no greeting and whenI ask about it she decided to argue with me instead saying she didnt call but she didnt call any of the previous clients also...Clients just walked up to her....I try and not make use of the branch for this reason...Bad service from staff. I am gisgusted in the manner the teller handled this situation .