Paying british gas bill?

I'm having great difficulty in paying my bill, since I moved in to my house, I registered and have waited been waiting since febuary to get my eletric bill. I have rang them countless times, given my meter reading, they keep saying they will send it...but nothing is turning up.
what should i do from here?
Update: have tried setting up online, but its not accepting my meter reading. and its not showing how much i owe.
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