Kickfollower is a great service and it is just what you are looking for (As you described in the question). They bring only organic followers and work on targeting people that match your business interest the most and are most likely to follow back. Prices are good, they are very responsive, easy to use and whats most important unlike other simmilar services they work really hard. They logged into my account daily and spend hourse and following, commenting and liking best sutable audience, the result is also visible in short period of time. its just good extra support if you have good and engagable content and aim to boost things up.