Hi! First things first, I can't do anything for Facebook. The price and timeline I've quoted, are for Twitter only. There, using Tweepi, a paid tool for which you'll have to sign up, I'll follow people who will follow you back, and thus increase your follower base. I'll also regularly flush out non-followers, and unfollow spammy and inactive accounts.
I've done this for clients before, and am currently doing it for a Swiss jewelry store, and they're happy with the results. I look forward to hearing from you!
Priya