I don't think that cars can access details on agile tariffs, though, should you go for one. Which would be a good idea if you have an electric car and don't need to charge it every night.
Ok I have no idea what you are getting at now and we've had an EV as our main family car since 2015, so 7 years now.
In the last 7 yeads 99% of EV charging has been done on E7 rates, so cheap night time electricity. You don't need a smart meter or smart charger to access E7 rates, they have been around forever, well since electric radiators anyways.
I suspect you may have grounds to go for a 'miss selling' claim if you got a 'smart charger' installed because someone told you that was the only way to access non standard rate electricity.