ren1316: Update:

Found the problem/issue

Went outside the house and open the 'box' where the wires were.

Its said: blue/white  pr to PHONE,   green/white pr to DSL.

Went inside the house, both phone and internet were only connected using 2 wires (the DSL line).

DIY the unused pair to the phone jack.

Sorted.

VDSL speed back to 51Mbps and phone works. And filter not required.

Happy.

Thanks everybody.