Welcome to the forum. I'm asking the moderators to look into this sorry tale for you, and they will post contact info here in the morning.
I'm really sorry your BT service was stopped without your permission. If the line is currently being provisioned by EE it regrettably will take a minimum of 10 days to get the line back, this is not something that we have control over. You should not be charged any cancellation fees or get any contract penalties and this is something that we can assist with.
Please use the 'contact the mods' link in my forum profile under the 'about me' section to send in your details and we'll help in anyway we can. You can find the link by clicking on my username.
To me this sounds a bit fishy, did you contact EE as well to discuss who created the order and when? Have you recently subscribed to EE?
I think i can understand that if you did move from one subscriver to another you would want that move to be smooth as possible however this is a problem as you did not asked to be moved.
I think a full investigation on both sides is needed, Neil the Forum Mod will defo be able to help!
I am currently having the same issue as you, I received the letter and cancelled the take over but it happened anyway!!
They have cancelled my bill but I am , fighting for compensation now
Let this board know how you get on. I'm waiting to do the same.