Spending Limit Changed without my Consent

Good day . This has been the worst service I have ever received . I Request a change of Ownership on my Cellphone Contract a few months back . After Telling the lady 3 Times to please keep my Spending limit to 0 after the Changes has been made . I noticed on my Telkom app the My Account is Running over the Spending Limit . I logged a case with Telkom and my case was closed within 7 days with no Feedback. a Payment still went off with the Spending limit include .