nostr:nprofile1qyt8wumn8ghj7un9d3shjtnyd968gmewwp6kytcqyq5av7epcrkzs5dnwdzutpk02cv2u6uxc3dtdwj8x4qkpkwt6kzq2rlzwws sounds just like Virgin Media AKA The Whore of Babylon. 

Their representatives refused and ignored my instruction to send a final bill after I disconnected them, so I stopped payments as they were in breach of any reasonable understanding of their contract, by ignoring my clearly given instruction to send a final bill. They stopped sending debt collectors after complaints to OFCOM which OFCOM are still claiming to investigate years later. 

https://www.ofcom.org.uk/phones-and-broadband/switching-provider/virgin-media-investigated-over-difficulties-cancelling-contracts