Yeh sounds a bit rough. But did they provide unlimited gas? I presume so..

 for a fixed price? Did they have a clause to say they could change it after n period? I don't know...

It sounds like they dropped their pants to build a customer base. They probably know that people are not going to like this, but if all the other providers are not able to compete at this price then you must consider you have actually had a good deal for the past period, and your allowed to consider moving providers if you are unhappy with their current offering.

I am going to be on gas next winter... so yeh I will be shopping around for a provider too.