re: Entergy destroyed my home's AC system

Power Quality standards require the utility to provide a voltage at +\- 5% of nominal so your voltage must be between 114-126 volts. The voltage difference between legs shouldn’t be much.
There isn’t anything, generally, on the customer side that would make the voltage increase so it is likely an issue with the utility.
It sounds like there is an issue at the transformer and the utility should investigate, then take responsibility for any damage that may have resulted from power quality issues.
Search for Power Quality standards and see what you can find from Entergy on it.