Telkom does not respond to Business account request to update billing details

Diverso Technology CC converted to Diverso Technology (Pty) Ltd and we advised Telkom via email (provided by the call centre on 04 March 2019) to correct the name and billing address on our invoices on 06 March 2019 (Business account number: ********** 60001). We received an email reply on 12 March 2019 to say that our request had been forwarded to the relevant department (with a reference number). By 25 March 2019 we had no further response and an email was sent to Telkom to query. On 27 March 2019 we received an email from Telkom requesting our accounts details - all this information was on the original email, and on the reference number we had received. The reference and account number was resent to Telkom on 28 March 2019. By 3 April 2019, we phoned Telkom to find out if anything had been actioned, and were referred by Polani to a supervisor, Jade Japhta, who would be able to assist us. We emailed Jade with all the necessary information on 03 April 2019. Jade rep**** with an email on 03 April 2019 to advise that she would be escalating the matter. We emailed Jade on 08 April 2019 to follow up - no response received. We emailed Jade again on 16 April 2019, as our latest invoice was still reflecting the old details - no response was received. We phoned Telkom on 23 April 2019 to follow up, and were advised by Songezwa that we were to send all the information to the ********** address, as they dealt with Business accounts - not once was this mentioned by any other person dealing with this matter. We were originally told to send all the information to the ********** email address. All the information requesting that our account name and billing address be changed was then sent to ********** on 23 April 2019. An automatic reply was received from ********** on 23 April 2019 acknowledging our email was received. We phoned Telkom on 26 April 2019 to find out whether the change had been updated, but were told that the ********** department could not be contacted telephonically, even by other Telkom departments, and we were to wait for a reply from them via email. We received our latest invoice on 13 May 2019, and it is still reflecting our old company name and billing address. Should this invoice be paid, as it has not been addressed to the correct company? How are we to resolve this matter if the relevant department does not respond to our email requests and cannot be contacted telephonically?