No (absolutely no) customer service

It is seemingly impossible to get ahold of anyone in the accounts department. Telkom is clearly not picking up my payments and I have tried to phone on various occasions, holding on for more than 30 minutes at a time. (This is not a new issue, so please do not blame COVID) Today Lydia from Collections called me, and she requested me to email the documentation through. And guess what? That email address does not work. Is there ANY WAY to get hold of anyone at Telkom Business Creditors/ Accounts?