How to escalate a refund issue for Xbox Game Pass?

In November last year, there was a 3 months for $1 deal for Xbox Game Pass.

I thought it was a good deal to try out the game pass so made the purchase.

Two weeks ago, I realised that I had been incorrectly billed full price for both December and January. It seems that somehow I was only given 1 month in November and then was billed normally for December and January. Below is the timeline of actions from my side:

13 Feb: I clearly explained the issue and requested a refund using this form https://support.xbox.com/en-US/forms/request-a-refund

14 Feb: Received a refund denial: "We can’t provide a refund to this request. It’s been longer than our refund policy allows for digital game products. Thanks for understanding." It seems the explanation was not read properly and the refund was denied.

15 Feb: Submitted another refund request asking the support agent to please clearly read my explanation in the first request and that I should not have received these charges.

16 Feb: Received a refund but only for the January bill, still need to get my money back for December. Tried to submit another request but the form forces you to wait 72 hours before submitting another request

21 Feb: At this point, I am very frustrated by the lack of understanding and hours spent following up on this issue so I submit another request but also vented about the terrible support (in hindsight I should have been a bit calmer). Again I requested them to clearly read my explanation that I should not have received these charges, and I have even already received a refund for one of the months.

22 Feb: Received a refund denial: "We reviewed your requests and found it's/ they’re not eligible for a refund under section 16 of the Microsoft Terms of Sale.".

This time the support request number was not provided. The section just said, "Your support request number is if you need it."

It seems they are now trying to make it difficult for me to follow up?

27 Feb (today): I attempted to make another request but again received the message to wait for 72 hours.

I don't know where I should go now. I have searched but cannot find how to escalate this and get my money back.

I really don't want to have to keep submitting more support requests as it seems the agents are not understanding and it is taking up a lot of my time to clear up a mistake from Microsoft's side. (and I have to wait 72 hours every time it is denied!)

Does anyone know how I can escalate this? Also, apologies if this is the wrong place to post - please point me in the right direction if I should try somewhere else.

Regards,

David

:)