Disappointed mtn client

I have been with MTN as a loyal client for over 25 years and I am disappointed with their service. I have been emailing both *** and since last year 2024 with regards to 2 issues 1. my phone was 5 months old and I had to take it in to the technical dep, as it was showing a water error mark. Still under warranty and phone was not dropped in water. Was told that I need to pay for the damage. I found this is unfair and the phone was never dropped in water

2. I then did an early upgrade with MTN, mentioned to the sales consultant to amend the debit order to the 15th, Was confirmed it was done, first payment , was processed end of month, went in again and was told it has been changed to the 15th, Again debit order end of 30th, called in and the agent informs me that it is marked for the 15th and sent me the proof on whats app. This is unacceptable service, no one comes back to you on several emails .