Gas meter problem

Hope someone can assist me with a matter with my gas meter. I am not getting a reading off it. I moved into my rental property about 8 months ago it has always shown on the display as if it is a pre payment meter, as you can say it says credit £42.68 on, no proper reading displayed on it. I believe it is a smart meter. Who would I speak to to sort this out as I’m not really sure who maintains the meter is it bulb or would it be British Gas? My electricity meter is reading fine

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