I would respond as such.
Dear Sir or Madam,
At this juncture we gave 2 options.
You can except my 4 start rating and positive review and respond to this message with a heartfelt apology for trying to pressure me into a fifth start .
The alternative is I can give my honest account of your strong arm tactics every chance I can among wet shaving enthusiasts platforms.
Have a lovely Day.
FYI,
Never let a Bully see you blink. Hit first and hit hard, they always tuck their tails.
The vendor isn't being a bully, they're just trying to protect their ranking in a system that's actively trying to punish them.