This may not be news to you, but banks make mistakes. It can be frustrating, spill into other parts of your life, and drain time away from more important things.
However, sometimes things get resolved -- and quickly. Lifehacker is collecting stories about bad bank experiences and how things got fixed. When something goes wrong, the most important thing to do is notice it -- otherwise it'll get worse -- so it's important to keep an eye on your accounts and check the bank's math periodically.
For the most difficult situations, it seems that going into a branch and speaking with somebody in person is the most effective approach. It's also the most time-consuming. An alternative that Lifehacker readers are fond of: leave your bank and work with a small bank or credit union.