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Think could be that it was set to send reading once a month ,changed to half hour will see !
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It's likely that the meter will still only be read once per month. The meter will store the half hourly data until the download is requested by your supplier.
You could try turning the display off and on again to see if it reconnects to your meters. That might resolve the 4p issue and show a more up to date value.
But, I would suggest contacting your supplier and telling them that you think the meters are faulty because of the blank display. If the display is blank, how can you read it? If you can't read it, how can you get accurate bills?
Good luck.