Hi there - thanks for the information, and sorry you're still having trouble.
Could you please try clearing the cache on all your devices?
If that doesn't work, it could be that your ISP hasn't completely updated its DNS records, so they're still pulling in your old domain's old DNS record, prior to the WordPress.com mapping you did on your domain. If this is the culprit, you may need to wait up to 72 hours, as that's how long it can sometimes take for an ISP to update its records fully.
Or, it might be your devices that need to have their own DNS cache flushed. The instructions for doing that differ depending on your operating system. For your computer, culd you please let me know what OS you're running (Visa, Windows 7, etc.) and I'll let you know how to do it? Thanks!