Vox cut fibre service off early but won't refund pro-Rata amount

In February I notified Vox that I would be moving in March as I had sold my property. I requested that my fibre connection remain active till the 31st March which they confirmed. I therefore paid the full monthly subscription for the month of March. On the 13th of March Vox cut-off our fibre connection. We called to complain and were told this sometimes happens but they could not reconnect us. I was furious. We then lodged a complaint instructing Vox to refund us with a pro-rata for the remaining period, for which we had paid, but were not going to get any service. The reply was a straight, no refund will be made. Sickening how some corporates could not care less.