Unless things have changed since I was very active re FTTC, IIRC three orders are executed by Openreach.
First,
your connection is terminated. (In Openreach language a disconnection is still an "order").
Second, this has created a spare connection at the cabinet and it is allocated to the top-of-the waiting list order. (
Your Vodafone order is bottom of the list assuming there is a waiting list.
Third, the attempt to connect you for Vodafone fails so you are instead connected to ADSL2+. Waiting for the waiting list to be reduced over time until you are at the top and get the next freed connection.
I assume you were talking to the first tier sales or support. You need to get the second or third tier to get someone with sufficient experience and knowledge.
We know that the organized workers of the country are our friends. As for the rest, they don’t matter a tinker’s cuss - Manny Shinwell
Connections: Pixel 6a on Three 4+ (LTE)/5G, OnePlus 8 Pro on EE in reserve. At home Three Mobile, with (Three)ZTE MC888 router giving 5G most of the time..