Worst Ever Upgrade experience with MTN Upgrade!!!

My horror story so far: I did an online upgrade of my MTN mobile number in June 2023. I was contacted to confirm the upgrade and the cellphone of my choice twice. After the details were confirmed, the wrong device was delivered. I contacted them call centre and they arranged for the device to be collected again so that the correct device can be issued. The device was collected a few days later by the delivery service. I have to to this day not received my correct device and now it is more than SIX months later. I have contacted MTN customer care and found out that it was actually their vendor Mondo who handled the upgrade. Since then I have contacted both MTN and Mondo several times with zero results. No ever follows up or provides feedback and it seems no one knows which process to follow either. Apparently Mondo is waiting for feedback from MTN's warehouse and have no clue what to do. I have been sent from pillar to post and no one is taking ownership of my incident. I have contacted one department after another, the warehouse, the delivery department etc. No escalation is done even though I have asked for it repeatedly. I seem to be responsible for incident management and 3rd party management for this matter! There is simply no accountability, how can an open incident remain on an organization's system without updates and resolution for SIX MONTHS! I have now been paying for a device that I have never received!!! Customer service? Non existent! Really pathetic...