Justin,
Telstra are notoriously difficult to deal with.
I have has success by advising Telstra, in writing, that if they don't agree any future problems will be their responsibility. Remind the m that we try to plan and manage the road reserve, including all the service authorities.
Good luck!
Until the 'road authority' has the authority, this problem will continue.
Harry
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Harry Seccombe
BANGALOW NSW