Can a copper line fault be a broadband problem?

Sorry if this isn't the right place for this question, but hopefully someone can help.

If I have a copper line problem (eg: line break or battery contact fault) will this always be a PSTN issue or can it be a broadband problem?

An ISP (who shall remain nameless for the moment) is claiming that some copper faults are broadband issues but others aren't.

I thought that all copper faults were primarilly PSTN issues.

A good pair of wires is what you want, as this will produce the best in both voice and broadband.
What is the nature of the fault you are trying to report ?

Some faults that affect broadband may not affect voice services to a noticeable extent, and occasionally the other way around.

So it all depends on the exact situation.

General rule - if the fault is apparent when ALL broadband kit and filters are switched off and unplugged from the line, then report it as a voice fault.