Cancel it first in the Google Play app (Profile › Payments and subscriptions › Subscriptions). Deleting your account does not stop Google Play's billing, so the app's Delete button stays unavailable until the subscription is cancelled. After cancelling you can delete straight away; any remaining paid days are lost.
While your company plan is active, the app's Delete button stays unavailable until the plan period ends. To delete sooner, contact us by email or phone; the remaining plan period is forfeited.