VOX??? Where are you?? Anybody out there??????

I cancelled my fibre account with Vox end September 2017. No one advised me that I had to return the router. I now live in the UK and have no use for the router, which was left in a safe location for collection at my premises. Vox continues to bill me for the router, adding interest each month, despite the fact that I have communicated with them by email and have a confirmation through an online chat that the router will be collected and that all charges for the item will be reversed. Guess what? I wake up this morning, three months after cancellation of the contract, to an email with an account attached!!! With further interest added! This company is in the business of communication, AND YET, one CANNOT EFFECTIVELY COMMUNICATE WITH THEM! I cannot recommend VOX to anyone given their unwillingness andinability to resolve this issue.