Ford Lazarus Centurion - Cannot fix Ford issue after replacing battery

I have owned a Ford Everest for more than 6 years, Around April 2024 the battery was replaced and a month later it went flat. Took the car back to Lazarus Ford, paid for diagnostics (no errors found), battery was charged and all seemed ok. Since then the issues steadily worsened. I took the car in at least 3 times (and called many more times) - each time I was told that there were no issues and that I was not driving the car often enough, and should do around 50km of highway driving daily. It was also suggested that I get a trickle charger. Towards the end of 2024, the battery was going flat overnight. It didn't matter how often I said that there was a problem - they ran diagnostics and found nothing as they always charged the battery first. Again sent it in to Ford and a few days later they called to say no issues, battery has been charged. I asked that they keep it overnight and I will pick up the next day. The following morning, as I expected, they called to say that the battery was flat and they needed to do further checks. At the end of that week, I received a call to say that they cannot fix the car and I should come pick it up and take it to an auto electrician. Throughout this experience, the workshop manager was difficult to get hold of and would rarely return calls. The service consultants seemed embarrassed every time they had to give me the same feedback from a useless service department. So Lazarus Ford wasted my time, cost me money and broke my trust in Ford. I wanted to replace it with the Everest Platinum however could no longer trust the brand if they could not fix their own vehicles and I sold the car at a loss. (The car had no after market installations like a tracker etc.)