Vox telecom non existent service

After an ongoing problem with a faulty Lte router starting in January 22, numerous e-mails and phone calls later, with promises to replace the router, I stopped payment as I had no service, to this day they have still not collected the router which hasn't worked since January 22, but today have threatened to list me with the credit bureau, should I not pay R2000 for the Router that they haven't collected. Do not touch Vox with a barge pole as a service provider