This is not really my area of expertise but, as nobody more knowledgeable has answered this, I’ll see if I can help.
First of all, you are not talking directly to BT here. This is a customer-to-customer help forum and the only BT employees are the moderators. They are very good but a small and busy team so it may be a while before this gets picked up.
In this day and age, these might be altnet cables, (Alternative Network provider). Assuming they are “BT”, unfortunately they will be nothing to do with this website. This is BT residential ISP customers. Infrastructure like cabling is Openreach. While they are both part of BT Group, Openreach and BT retail are separate companies. Furthermore, Openreach don’t deal directly with the public but you could try reporting this as damage on their website:
https://www.openreach.com/help-and-support/damage-health-and-safety
If that doesn’t do it, your best bet is to report it to your ISP and they will pass it to Openreach. In the case of BT that will be phoning customer services on 0330 1234 150.
I’m sure someone will correct me if I’ve got any of that wrong.
