Vox unacceptable service

We recently moved to a new house. We paid all the extra costs of the installation fees and our monthly fee. This morning I received a suspension notice email from Vox, as they want me to pay for a full month from last year that we didn't even stay at the old house anymore. Everything was in order and we were happy that we finally settled everything with Vox knowing that everything would run smoothly. Everything was communicated clearly via phone calls and emailed documents. Now all of a sudden, almost 2 months later I must pay for a full month of wifi for a premises we didn't even stay at? This is unacceptable!!! We will not pay for the wifi we didn't even use. This is pathetic and makes us think that we should rather move to another service provider.