Amazon Prime Video Charged Me $5 for Support - Is This Normal?!

I am an Amazon Prime Video user and I recently contacted support about an issue I was having with the service. During this call, they assisted me and resolved my problem, but I was charged a $5 fee for the fix. I am not sure whether this phone number actually belongs to Amazon or to an authorized partner, and I am concerned about the legitimacy of this charge. I would like Amazon to clearly confirm whether +1 855 361 1*** is an official Amazon support number and whether the $5 fee that was taken from me is a legitimate, authorized fee. If this number and fee are not official, I request that the $5 be refunded and that I be informed about any further steps I should take to secure my account and payment information.