Well the broadband checker is fibbing for now!
That is highly unlikely. This is the BT Wholesale checker I am talking about. If it says the exchange is upgraded for WBC ADSL 2+ then it's upgraded. No if's and no buts.
Mistakes in this checker are all down to being shown coming from the wrong cabinet, which is not relevant here. The idea that BT Wholesale have randomly upgraded it in the checker to WBC ADSL2+ when it is not is very small indeed.
As an example to not showing stuff my cabinet has physically had a g.Fast pod on it since September, but it is still not showing up on the BT Wholesale checker that I can get a g.Fast service.
If you are 100% certain that it is wrong, I am sure the folks over at thinkbroadband would be very interested hear about it.