Your gas company sounds very much like that dog British Gas Plc (Centrica Group)...
Just phone them up and say your boiler is not working... If they ask any questions; just respond with:
"It's a boiler, I'm an office worker - How the hell do I know what is wrong with it; that's what I pay you for... It's not working, your engineer broke it during the service - Send someone now."
Always works for my clients.
GasAid.co.uk
January 2007