If things go wrong
If the level of customer service is less than what seems reasonable, you can either leave or try to resolve it with the staff member or their manager.
Be polite and as clear as possible about what you want, or what has gone wrong. Many customer service issues are caused by miscommunication or making assumptions. Make sure everyone has the same understanding of the issue and how you would like it resolved.
If you can't get an outcome you are happy with, you might want to make a complaint and/or write a review.
How to complain