Is there any way that I can find out the exact month, day, and year that I had changed my...

Hi Zëë! My name is Darhlene and I’m here to assist you.

The best way for you to know more about your Gamertag is to contact Xbox support. They will have the necessary tools to look it up for you.

Just a friendly reminder that we are Xbox gamers just like you in this community. We are not Microsoft employees and we do not have access to your account or any tools to manage it.

Try to contact their Xbox Live Chat Support, here's how:

1. Visit the Xbox Support website: https://support.xbox.com/en-US/contact-us/
2. Click on the "Contact Us" button on the right of the screen.
3. Select the issue you need help with and click on the "Next" option.
4. Sign in to your Microsoft account.
5. Follow the prompts to connect to a live chat agent.

Kind Regards,
Darhlene

There's no way to find out the exact date. It can just be any time within 10 days of the game's release if you paid with a credit card/Paypal.

Hi, I am also with slingshot AYCE plan and have had the same exact problem as you guys are reporting since around the same date. Im pretty annoyed because I had only used a few days of my 1 month gold trial before it went down and now my trial has expired.
I have since bought a 3 month subscription but dont want to activate it yet with the matchmaking in halo not working. Halo 3 and Halo Reach are my only multiplayer games right now so activating my 3 month subscription is pointless. Has anyone had any progress
so far or had any luck finding out what we can actually do to fix the problem? Cheers

I had the exact same thing happen to me this morning too. I changed to one month subscription a week ago because I couldn't afford a 1 year renewal and this morning I checked my account and I also had a charge for 1 year gold subscription. On my billing
account page it says that my 1 year gold is canceled and 1 month gold is active. Maybe it's a problem lots of people had and they will fix it.

I had same issue with my account two years ago, I called customer support to fix it. I had forgotten I had changed my membership from month to month to year to year. I had not change it in time for the billing. I had it fixed and it was credited back to
me. You can change you billing but it may take a month to show the change. Same as if you change your email and other things on your account. Call customer support and they will help you with this.