engine - 2:35 pm on Oct 28, 2011 (gmt 0)
How do you know they are not listening? Perhaps they are just not responding. Use links to your stories, products, etc., and watch your site stats for pageviews.
Try to engage with your followers. Look at what they are tweeting, and at the very least, RT. Better still, react and communicate back. It's a two-way street. if you're communicating with them thay will see your profile in a different light.
Additionally, just taking a general view that if you're tweeting at time when your audience is asleep you're less likely to see reactions and RTs.