Start a complaint. I've had no data from my Gas meter for 18 months. As of this morning, my electricity meter has stopped transmitting data too.
"Utilita is currently in breach of your Electricity and Gas Supply Licence, specifically condition 39.17 which requires "Where on any given date a Smart Metering System is maintained by the licensee such that it satisfies the requirements in the Metering Equipment Section of a particular version of the SME Technical Specification"."
Basically, they are legally obliged to make sure that smart meters operate as they should.
Don't expect a quick response either, it's been 46 days since my official complaint went in and it appears Utilita are ignoring it. Will be escalating the complaint through the Ombudsman shortly.