It's basically the same problem I had when the tariffs changed. The supply company were still getting usage readings from my meters and providing the correct bills but my remote display had the wrong tariffs and standing charges. It took 5 emails over approx 6 weeks to finally get it sorted.
Have you tried resetting your display in case its not in communication with your electric meter. On my display hold down the on/off button for
30 seconds to reboot it.