Sounds like you were the one who always took care of everything (as we all do) and he still wants that. A's will manipulate, cajole, sweet talk, etc to get what they want. Then when they get it.....they're right back to the old behavior.
Stay NC, it was the best decision. You didn't intentionally talk to him, he used a number you didn't recognize. But if that happens again, I would agree with what's already been said here. Tell him you do not wish to have any further contact, wish him the best.....and hang up. Keep moving forward towards your own emotional health.