I suspect, but I don’t know, that Oyster payment is the problem in these situations. You paid for the journey that you took and that wasn’t delayed so no refund would be appropriate. Had you bought a paper ticket for the journey you wanted to do, perhaps a delay could have been justified and a refund paid but I don’t know enough to be sure.
I find this to be a failing on any suspension when you get the “Tickets will be accepted by other operators” messages. That’s fine if you have an actual ticket but, with pay as you go, technically you don’t so you always end up paying for the journey you take rather then being able to benefit from any sort of route transfer arrangement.
(I worked for TfL until a week ago but have no inside knowledge in the fares/ticketing area)