How serious can be the consequences of increased voltage in the network?

Question

Batteries

Empirically (a multimeter with a voltmeter function), it turned out that the constant voltage in the network is ~ 250 V (before the counter), which is a clear deviation from the norm:

11.4.7. Standard rated voltage Uп for a low-voltage tether of a high-voltage designation may be 220 V between phase and neutral wires or between phase wires:

• for three-phase choti-conductor wires: Up = 220 V between the phase and neutral wires;
  
• for three-phase three-wire wires: Up = 220 V between phase wires.
  

The voltage change is not responsible for overestimating ± 10% of the nominal voltage value.

https://zakon.rada.gov.ua/laws/show/v0310874-18#n11
How serious can the consequences of electronics work in such conditions be?
I noticed that the light bulbs constantly burn out in the room, and the phone, which has been used (charging) for a long time in such conditions, can charge several times longer, but it will only charge 50% under normal conditions. Could this be the result of increased voltage in the network?
Now I looked, on the monitor for the PC it is indicated -: 100-240V~
Does this mean that they will refuse me warranty service, for example? What are the consequences of working on a 250 V network?
First of all, the opinion of those who faced a similar situation is of interest. Is it worth wasting time and asking the electricity supplier to fix the problem?

Answer 1

Fuck burn. If you're lucky - BP, if not - then all at once. It can also get cold with a TV. Bang on the shield like this.
worth a penny, but you won’t have to worry about your ass

Answer 2

The consequences "how lucky", from none, to "burn out", as already written, everything is individual.
What to do? Private sector?
Most likely a phase shift. You have a lot, but in the other phase there is little, in the third phase - xs (maybe even the norm). Walk around the neighbors - measure. Some part (up to half) will have less than two hundred.
Pound power engineers so that consumers are thrown between phases. It is also beneficial for the supplier, as an enterprise, and for "electricians" it is just extra work.