Need help with Telkom email box

Hi, I am contacting HelloPeter because the Telkom team working on HelloPeter reviews were very helpful to me a couple of years ago. I have hit a problem with my Telkom email address. I am involved in the Clearing House project for students, and the number of emails I receive has grown exponentially. Telkom website said I could increase the size of the box. I tried to use the enquiry form, but it requires a phone number and I don't have a Telkom line, only the email. The Telkom number for Technical enquiries on the website 10215 does not work. I phoned new sales (none of the other options seemed to cover email) and was referred to existing contracts. They said it wasn't possible to buy extra capacity, but I must archive or delete. I don't have time to delete thousands of items line by line. Sales referred me to Technical. Bianca in Technical took my details and said her colleague would investigate and call me back. That was 3 hours ago - which may not seem much to Telkom but in terms of this project is a devastating communication gap. I can't find out how to bulk delete or archive on the Telkom website and desperately need a solution. I have set up a filter to try to block the worst offenders (emails requesting callbacks which I don't have to deal with). Please, who can I speak to who could help me resolve this?