Landline keeps ringing at night
The landline at my parents' house has started ringing at odd times over night, eg 2am.
There will be one ring, then it stops. Only to ring again about 1 minute later. This can go on for about 1 hour. The handset doesn't record a number, but calling 1471 does, and there has been at least 2 different numbers.
I contacted customer services and they insisted that a technician had to visit. He knew nothing about the calls and just wanted to upgrade them to VOIP. That has been postponed for a week or so, and I wasn't convinced that "you'll never have another phone problem" was totally true!
It has got to the point that my parents are switching off their phone over night, but that isn't really a solution.
Any thoughts? They really can't be without a landline because of various medical issues.