There are several tools available that you can use to track your follower's growth and unfollowers, such as crowd fire and unfollowerStats. These tools will allow you to accurately track the number of followers and unfollowers on your account, as well as give you detailed analytics on your follower growth. Additionally, you can use Twittr's analytics dashboard to gain insights into who is following you, who is engaging with your tweets, and which accounts are gaining or losing followers.