It sounds like we completed a network upgrade in your area (possibly turned down AWS spectrum?) to implement a better overall experience. This is an awesome change, and when we complete these shifts we do typically offer some type of replacement or discount so that you can get a break on compatible equipment - clearly it's not ideal if you missed the initial opportunity to upgrade because you were traveling during the time we reached out to you.
Unfortunately, we don't have account access in this forum, so resolving this will require contacting Customer Care or T-Force through one of the icons on my badge below to see if such an offer is still available on your account, or if it's showing in the history and can still be honored. It may honestly depend on how recently these changes were completed in your area. I'm hoping that we can make it right for you, so that you can enjoy the improvements when you're here!