"In a world" where everything is (or should be) instantaneous for certain things, I find it annoying that the business world is still gaming the system. Bills come through immediately, even on weekends. Payments go through immediately, even on weekends? Credits? Sorry, it's a weekend so you have to wait until Monday.
I goofed, but in my defense, the website had font smaller than you're looking at now and a lot of dead space. It said I owed $XXX.XX In the payment dropdown I keyed what I thought was $XXX.XX. Yeah, I should have zoomed into the window to try to see exactly what was in the entry, but who expects it to miss the decimal point? Why does the website not check for overpayment or ask for a confirmation?
Imagine my shock when I get an email from my charge card that my charge of $XX,XXX.00 is over my limit. I go back to the billing website and I now have a bill of -$XX,XXX.00. The email for the bill says to call a number, so I do - someone picks up and hangs up immediately (I heard background voices briefly). Recalls just ring, then ask to leave a message - but the phone number it says you're leaving it to is not the number you called. Charge card (automated message) can't do anything until the actual charge goes through in 3 days. Meanwhile they might not honor any future charges because I'm over my limit.
I go to the office of the biller, wait for the office mgr. to show, he reverses the entire bill. The billing account website shows the correct original amount owed. Does it show up as a credit to my card? Nope. Even hours later. It's digital, why would it take longer than the payment to show up?