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I agree with the 3 electricians... 248 volts is not likely to be the cause of the problem.
That voltage is well within what would be considered a normal operating voltage for a residential service.
The issue you are likely to run into with the utility provider is that their transformer that feeds your home most likely has other homes connected to it.
If they lower the voltage at that transformer, any other homes fed by it will also see a reduced voltage. If those homes are not having any electrical issues, lowering the voltage at the transformer could create issues at those properties.
That being the case, the utility provider is very unlikely to make any voltage adjustments.