Thanks so much for the feedback! I totally see what you mean. In the next update, I’ll bump up the number of Hackbots needed to unlock the Callcenter, but the permanent Hackbot cost will be gone — so unlocking it should feel a lot better!
The idea behind raising the requirement a bit is that the first Callcenter will basically be a freebie, since it's the only way to start producing Dollars. And because Dollars are the top-tier currency in the game, I want to make sure they don't pop up too early in the progression.