1. Unplug all the ADSL hardware
2. Is the line still noisy?
3. Report a voice fault and DO NOT mention broadband at all.
If there is no NTE5 then while you should not play around, generally removing unused extensions goes a long way to cleaning up a line, and helping confidence that issue is not in the property.
Generally the engineer will attend and fit the NTE5 as part of the visit, and only make it chargeable if you want the extension wiring reconnected.