Please cancell my Telkom service

On Saturdays 11 November 2017 I visited 2 Telkom Shops in Clearwater Mall in order to cancel my service with Telkom (fixed line and ADSL). As per the staff at both stores the are unable to assist to cancel my service. At both store there were no manager available to talk to. I was instructed to cancel my service via E-Mail. On Monday morning I E-Mailed the forms, as per their shops and received back 2 automated E-Mails 1) to say that they will contact me in 21 days and one that says that the recipient's E-mail box is full. Now I ask you what more must I do to cancel my service. This is exactly the reason why I am cancelling my service - no service at all.