If you don’t get a response by the end of day, I would seriously consider putting it into the hands of Motability to sort, as discussed yesterday. Otherwise you going to be trying to phone Ohme again and waste another day..
By broken, does Ohme mean, it requires an engineer visit to confirm this or the engineer to try and fix and if not request a warranty exchange and come back another day to fit it, which leaves you longer without a charger!