Is the Drop, the wire from telco connection to your house, buried or Ariel? In any case it NEEDS to be twisted. Not a "flat" drop. That drop if not twisted is hundreds of feet of untwisted un shielded "Antenna" for RFI. There is a lot to know when dealing with ADSL, VDSL, services. And to answer
@Mattax question about coax VS Twisted pair for Digital circuits. The battle has been raging ever since the phone company had the audacity to challenge the cable providers with High speed Internet. A digital circuit runs on the outside of the conductor. So a coax wire has more bandwidth potential. To combat this, DSL compresses the info. But when you compress DSL on a circuit providing either a Video, like Netflix, or audio, like Samsung music, it loses quality. So the slower the speed, the lower the quality. Now Telco DSL circuits are Fiber rich. Help with the distance issue. And yes the twist in the pair of wires combat RFI. To a point. Coax is more immune to this because it uses a shield that is grounded. But those circuits have there own issues...
O and those little DSL filter you put o your phone, It does block out the DSL sound from the phone, But it also prevent bounce back, or reflection. A HUGE issue with DSL.