No response on outstanding matter with Autopage

Having contacted Altech Autopage regarding airtime lost I have tried to get feedback from the retentions department in particular Colin Swartz who I was told would handle my query. I phoned numerous times and left messages for him however no response. I sent countless mails pleading for feedback however only received read receipts on my mail. No response was ever received from him in any form. It was then handed to Lucretia Khan who could not provide me with answers to my query. Once again no resolution. I have since used the complaints service line and for the fourth time have only received an acknowledgement of my query and a case / task closed response however no feedback or resolution on my query. It appears that Autopage cannot assist or do not want to assist me in the matter. The matter pertains to airtime lost from an upgrade when I received written confirmation I would not loose this airtime. I have sent the written confirmation to Autopage however no response.