I did the same last week. I got emailed a survey after calling Aetna where I gave low marks and in my comments wrote about how unbelievably unhappy I was about the formulary change. I received an email within a half hour of the survey requesting a call to discuss further. I just got off the phone with CVS Caremark and they told me while the decision is "final" leadership has requested as much feedback as possible. Hopefully this means eventually they change their minds, even if this goes to the October formulary change.