Zero customer service

I am a customer of VOX and Vumatel. All I want to do is move my line to a new premises. The issue is that I do not want to cancel my contract but just move my line to a new location.

I was made aware by VOX that unfortunately I will have to cancel my contract which kicks off the cancellation notice. Thus, I am moving into my new premises on the 4th of June but have to pay for the full month of June for service I cannot use at my new premises.

Someone needs to explain to me how it is absolute rocket science to just move my account to the new premises close to the 4th of June.

I need someone to help me with this because VOX doesn't want to budge and Vumatel is the faceless void as there is no way of making direct contact with them.