Quick update. The technical team have now investigated properly and come back with a sensible answer. Thank you OVO, persistence won out.
There are two ways of registering your car with the system - via the standalone ‘OVO Charge Anytime’ app and also via the ‘Indra’ app that manages the wall charger. The system can only use one method to calculate your credit!
I had managed to register my car with both! When I first got the car and was waiting for the charger to be installed I registered via the app and all worked well. Then when I got the charger installed I was registered via the Indra app as well. Initially the internet connection to the Indra app was poor with constant cutouts for 3-4 weeks. As the system was using that to calculate my credit the amounts were wrong as they did not have all of the data. The OVO Charge Anytime app however did get the data and so was showing me the credit (though its data is supposedly less accurate than the Indra app)….
The fix is simple. De-register my car from the ‘OVO Charge Anytime’ app so that everything is managed via the Indra charger and app. The tech team said that this was likely to be most accurate. They are now hopefully calculating the credit I am owed.
Would be good if OVO can get something in their FAQs around only registering with one app so that others do not have this confusion.
Hope this is helpful!