there are many spots to bold in this rule that would be relevant to the op. obviously the op was not trying to circumvent the system so what you bolded means that the op didn't violate the CoC. i bolded the last part because the op bought a b-fare which would essentially be the full fare. so there is no difference from the fare that the op purchased and the additional amount that united would charge retroactively (thus no penalty for what the op did). therefore from what i bolded, the op did not violate the CoC. essentially what i am trying to say is that there are many parts of that statement that would clear the op from any wrongdoing and thus the CSR was entirely in the wrong. not only because they should not yell at the op even if the op did something like that, but also that they op did not do anything wrong. not sure if a $600 voucher is a little bit excessive in this case (unless the op wasn't able to fly, in which case a full refund of the ticket and a $600 voucher would be appropriate). if the only consequence was getting yelled at then maybe a $100-$200 voucher. but then again, i got 3 e-500s deposited in my account from rcc agent because i misconnected due to a mechanical even though i ended up getting to my destination at the same time i would have. so if we were to use that as a basis, maybe a $300-$400 voucher would be in order.