I contacted Smart Energy GB about this and this is what they said:

Your smart meters and in-home display (IHD) should work as shown on our website and adverts. Energy suppliers must tell you why your smart metering system isn't working as it should and provide you with a timeframe for resolving this. Therefore, I recommend keeping in contact with your supplier as they work towards a resolution to this temporary situation.

If at any point you would like help in speaking with your supplier, I’d recommend contacting Citizens Advice who can be contacted on their helpline or online via their website: https://citizensadvice.org.uk/consum...onsumer-issue/