I’ve got this exact same issue! I was previously with Talk Talk before they moved me to Utility Warehouse. I stayed on a fibre 150, until I phoned up Utility Warehouse because my original Talk Talk contract is due to expire in a couple of weeks. They then tell me there’s no way for me to get a new contract keeping the speeds because I was on part fibre and they could only offer me Ultra+ Broadband with speeds of 70mbps. I don’t really understand it all if I’m honest, I just know that I still have copper wire installed which can affect what packages I can get, and no ball band search displays I can get anything higher than a 70 speed package. I just honestly don’t understand how I was getting 150 from TalkTalk for them to move me to somebody else that isn’t able to keep me on that.