No response from Vodaphone to corporate client

As a corporate client we've been sending emails to our client service email address as well as the VBS cancelation email address to cancel a contract. We've been trying to contact our representative for the past three months without any response from Vodacom or action on the request. This is totally unacceptable, as we are internationally based and can't phone you on the numbers provided on the website as it is only for local users. Historically we used to get a response and action within the same day from our representatives so what changed. Could you please be in contact in order to solve this query?