Query closed without the problem being resolved

I called Vodacom customer service 27 November to ask them to correct the upgrade date which was incorrect (ref ***). The call centre agent agreed that the date was incorrect due to a technical error on the vodacom system and that it will be rectified within 7 days. Today, however, I get a message that this query is closed. I then checked the upgrade date on the vodacom app, and noticed that the upgrade date has not been corrected. This is absolutely unacceptable that vodacom can just close the query without fixing the problem and then have the audacity to wish me well. Extremely disappointed with this service.