Fibre install caused mould

[#1]

I recently had fibre installed in my house by Plusnet, during which they drilled a hole in my wall facing the street. Since then black mould has steadily grown around the area it was installed. Can I ask Plusnet to come and properly seal the hole to stop the moisture coming in?

[#2 · Accepted solution]

@joek42 

Plusnet did not install fibre to your property, this was done by Openreach. 
Workmanship complaints are best directed to them, see https://www.openreach.com/help-and-support/when-to-get-in-touch-with-openreach/complaints-policy

[#3]

Much obliged, I've contacted them now.