The mails are sent out automatically 5 days prior to your subscription rolling over. They are sent for all subscribers whether the package has an associated cost or whether it's free. I guess in your case it's free because you'd want to know if you were about to be charged money. We are looking at the possibility of unsubscribing from these mails that are sent but that's not yet possible.
As an aside, the mails are sent to the "Contact email" as registered on the Account Information page in SDL Language Cloud. If you log in to your account at languagecloud.sdl.com/.../login you could then selection "Account" from the left menu and change the Contact email as required.
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