Account Execs being unable to delete reviews does not mean that account execs are unable to tell customers that they can.
"Give us money or bad things will happen" is a shakedown, regardless of whether bad things can or will happen.
"Give us money or bad things will happen" is a shakedown, regardless of whether bad things can or will happen.
There very easily could be an exception, especially with the number of Account execs they have right now, but it's clear from the very start of training to making actual calls that such actions will not be tolerated.
It would be very easy to avoid these types of accusations if they just recorded the sales calls, or even recorded just one side of the sales calls (to avoid recording the other person - Skype extensions can do this easily enough).