First time this has happened to me on the Intelligent Go tariff. The email goes on to explain they will manage it as an account credit in the next 2 weeks. Presumably they have a trigger level for overnight electricity usage on Tuesday night that cancels the rebate.
I charged the car up from 52% to 80% last night even though I wasn’t expecting to need it today, so it’s mildly annoying they didn’t give any more notice than this. Even so, I’ve set the car to take a charge up to 100% tonight. Offspring is on study leave now so I’m not even doing the school run. A full charge will probably last me until the end of next week.