Telkom refuse written information

On 24/3/2022 I went into the Telkom "service" centre in Vanderbijlpark in order to obtain an email or postal address to which to send written details of errors on Telkom billing on my account.

Neither the "service" assistant nor the Branch supervisor Ms Nono Zwane would provide me with any information, nor would they accept receipt of a copy of the letter providing the details (to assist in rectifying the account).

How is this supposed to help? My account problem cannot be solved over the phone (been there done that). The so-called service centre refuse to help. Telkom will not provide me with details of where I can send written information.

What is the solution?