When we moved house last year, our VDLS2 service moved too.
Trouble was that when we moved to our new address, our VDSL2 service moved to someone else's house - about a mile down the road - who also had BT Infinity.
BT Retail said our service was working just fine.
So it was - just not by us.
Thanks to this b*lls up by - yes you've guessed it - Ned Kelly Communications Ltd.
It took nearly a month to sort out this "cross-jumpered tie cable".
To do that, they would have had to diss off the correct tie, from the other subs D-side, before giving them the tie that was supposed to be ours!
Perhaps something to bear in mind, but more likely a duff filter.
I would try with the BT ECI box first.
If that doesn't work, then try another filter
Don't go buying an another ADSL only router if you've got VDSL.