Corporate customer service replies that start off with s*** like "We're so sorry that ...". Okay stop there. You're not sorry. You're definitely not "so sorry". "So sorry" is for accidentally running over someone's foot or hearing their house burned down. The over-the-topness of it makes it sound patronizing and fake. Consumers now are hyper cynical as to big business caring anyway, it's so ridiculous. We know you don't truly care.
I'm just writing to complain about being charged for queso in the online order and the local Chipotle being out of queso when I got there. Just say "Hey sorry for the frustration, we'll follow up with the gang of retards who staff your local Chipotle and ask them why they were out of queso at 3pm on a Saturday. That definitely shouldn't happen. In the meantime here is a refund for the charge and a coupon for free chips."
See also customer service replies that start with "oh no!". "oh no!" is for children who drop their ice cream or topple their tinkertoys tower. Please just talk to me like I'm an adult.