Done!

app/src/main/java/app/insti/fragment/BodyFragment.java

@@ -231,7 +231,9 @@ public class BodyFragment extends BackHandledFragment {
                     public void onResponse(Call<Void> call, Response<Void> response) {
                         if (response.isSuccessful()) {
                             body.setBodyUserFollows(!body.getBodyUserFollows());
+                            body.setBodyFollowersCount(body.getBodyUserFollows()? body.getBodyFollowersCount()+1:body.getBodyFollowersCount()-1);
                             followButton.setBackgroundColor(getResources().getColor(body.getBodyUserFollows() ? R.color.colorAccent : R.color.colorWhite));
+                            followButton.setText(EventFragment.getCountBadgeSpannable("FOLLOW", body.getBodyFollowersCount()));
                         }
                     }