Here in the US we have 110-120 volts at 60 Hz and I have not had a problem with the probe since I have brought it. But you brought a different one than I suggested for you to buy and got one that, for me, wasn't compatible with my oscilloscope as my scope has only x10, x100, x500, and x1000 and I think x5000 so it wouldn't be compatible with this one:
https://www.globalmediapro.com/dp/A2JGB4/Pintek-DP-30K-Differential-Probe-30KV-50MHz/#lg=1&slide=0 which is why I didn't get it and why I didn't recommend it for you to get it.
Sure it will read voltages up to 30kv but if I had to search for and buy a new scope that would be compatible with it that would have cost me a whole lot more money. 15kv was good enough as it can really read around 17kv safely and the working voltages for the exciter array falls between the range of the 15kv probe which are 10-20kv according to Stanley Meyer. That is why I suggested that probe to you as it doesn't have compatibility issues with the scopes we use. Perhaps you got a faulty power supply or something but you violated the warranty so there is not much that can be done now as the company more than likely will simply wash their hands of you. But since you don't know what they will do please give them a call as I am sure they don't want their reputation to be hampered by someone making videos of them selling products that don't work.
I have two differential probes from them and both of them work fine. I was able to read around 8kv with the 6.5kv rated probe but had to finally put it away and buy another one that could read higher voltages as the working voltages for the exciter array exceeded it's voltage capabilities too greatly. I have another than can only read about 1000 volts that I first got when I was working on the 8xa circuits off of ebay. It's nice but I quickly reached it's voltage limits as I learned more about the technology. I still will make use of it as I need it's low voltage reading accuracy for the primary side of the VIC transformer and for circuit troubleshooting. They are nice tools to have as they block out a lot of unwanted noise and the readings are clear as my old probes would pick up the VIC and overhead working lamps voltage spikes.
I hope things work out for you as these are some needed tools that are a must if you want to be able to see what it is you are sending to the exciter array by the VIC transformer and pulsing circuitry.
be well,
TGS