Mailchimp Email SMS Marketing

I installed the app as I have used it in the past. Ultimately, I decided not to use it. I have found the pricing model is based of your stores imported contacts and order base. You are not given the option to import only a segment of your current customers. I have 4k customers and a specific segment of 300 I wish to email. These import models prevent me from being billed on my usable audience. Would like to see a change with Mai