Pathetic Service

I have a problem that has recurred. If a caller calls me and the call goes to voicemail (I have voicemail lite), the caller hears an automated message "YOU HAVE DIALLED AN INVALID NUMBER" I reported this to MTN on the 14th of March 2022, and followed up on the 15th and was told to wait 24 business hours. The problem was still not solved. I called again today (2022/03/23) and was put on hold for over 30 minutes for the consultant to obtain feedback from the relevant department. I cut the call and called back and spoke to a different consultant. She placed me on hold for a minutes then informed me that the relevant department informed her that the ticket was closed. I responded by asking how can they close the ticket without first confirming with me if the problem was resolved or not. Nonetheless she reloaded the complaint on the back of the old ticket and requested that i be assisted urgently as it is 9 days since i first logged the fault. Its frustrating to have to be subjected to this pathetic service.