Nikon's service used to be good - what happened Nikon?

I’ve been using Nikon gear for over 20 years and have always received good service from the Nikon agent – until now. In July 2023 I purchased a used Nikon 200-500 lens from ODP. My images were not sharp so in August I took it to Nikon (Premium Group) for them to service the lens. They told me the lens tube and zoom rubber need to be replaced – the rest of the lens is fine. They had to order a part, so I got the lens back in September. Communication was not good - I had to keep emailing Michelle to find out what the status was. December – January 2024 I’m in the Kruger and the viewfinder image and VR are ‘jumping’ and the D500 freezes – I could not scroll images, use the Live view and it was doing crazy things like saving a few images to each folder instead of waiting until there were 999. I took the lens and D500 back to Nikon in February and was told the Body is fine, but the VR is failing. I was wondering how the VR would affect the body, but I trusted Nikon and a new VR was system was fitted for R5000,00. Beginning of March, I’m in Madikwe and guess what – exactly the same thing is happening – viewfinder image and VR are jumping and D500 is freezing and doing strange things. I take the lens back and after a week the technician phones me to say he cannot find any faults and does not know why the lens and D500 are doing what they do. But he assures me that the viewfinder image jumping is normal. I’m not happy with that answer as I have used many Nikkor lenses from a fisheye up to a 600mm f4 and have not experienced this jumping VR. So I search online and come across this post by Thom Hogan on Nikon’s VR - https://www.dslrbodies.com/lenses/lens-articles/lens-technique/all-about-nikon-vr.html Problem solved! It seems the D500 battery cannot handle too much at once, especially when the power level is low – focusing the lens, live view and/or VR being activated, especially on ‘Sport’ mode. Thom recommends keeping the VR off and switching it on only when needed – shutter speeds under 1/1000 sec. and to use ‘Normal’ most of the time. I let Nikon know about this and all I am asked is “how old are your batteries’? I have six Nikon EN-EL15 batteries and they all show ‘new’ when checked on the bodies. I still do not get a possible solution from Nikon. I then do some research on Nikon batteries and see there have been upgrades since the original EN-EL15 were produced. I check my batteries and they are all Nikon EN-EL15 – since then there have been Nikon EN-EL15 (a) (b) and most recently a (C), which has a higher capacity. My question now is – was the VR replaced as I did not receive the old part that was replaced? Alternatively, did the VR need to be replaced? Did the technician not know what Thom published in 2020? Does the technician not keep up to date? Other professions require their people to attend annual CPD/CPE training in order to be current. I think purchasing the new EN-EL15 C higher capacity batteries may have sorted out my lens and camera issues. But I guess their job is to make money and not help solve client issues. Poor show Nikon!