Vox most unprofessional service ever

The service received from VOX Telecom has been totally lacking. As a customer for the last 2 years I have been expected to pay my account one month in advance for the month's usage. However, during this time there has been many issues with connection from Vox's part. I have during this time period formally complained in writing to Vox but have had no response nor did I receive any form of compensation for periods of extended loss of service. Vox however, will terminate service immediately if a customer does not make payment timeously for the coming month.