Yes and no. The likes come from accounts that were created by real people, but you only receive them because you purchased a package.
No. Likes will never be removed from a post unless you delete the post, or Instagram deletes the post due to a violation of their ToS.
Sure. If you purchase 500 likes for 30 posts, your next 30 posts will each gain 500 likes. After 30 posts you can renew the package.
We take payment via PayPal - this way we can process the orders much faster. You can also use a Credit Card.