Bright, Keep those expectations at zero. You are looking for him to respond back quickly and usually they don't. They get distracted very easily. I know you get frustrated w/him, but trust me when I say that he's distracted most of the time. Whatever interests him at that moment is what takes his attention away from the matters at hand.
You did your part...you responded back to him. Now, it's up to him to respond back to you. If you don't hear from him within a reasonable amount of time, you'll either 1) have to remind him to pay the taxes; or 2) you'll need to pay them. You can't rely on them.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.