carlsorff: At the moment if the tariff is going to be the standard one, better i'd carry on with Scottish Power...Could I go somewhere else without incurr in any penalty due to their mistake?
I'm not entirely surprised with what has happened but its certainly disappointing. I don't disbelieve you, this is a tactical question, how did you sign-up and can you prove you selected Websaver 6 dual fuel?
I strongly recommend you stick with it rather than trying to invoke (or invent) an escape clause. That would just be a different and probably more difficult can of worms.
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Later edit regarding leaving Websaver 6 without penalty:
Well you can leave a Standard Tariff without penalty on 28 days notice. So if that is the tariff you are on.....
It's still a can of worms if BG turn round half way through the process and say you are on Websaver 6 after all. So not changing my advice. Up to you what you do.