Refund denied

You can try replying to the email denying the refund to contact the refund specialists. Otherwise, if they deny the refund there's really nothing else you can do.

Then if they've denied the refund, you're not getting a refund. Refunds are not guaranteed.

Then fill in the refund form on here instead to see if they can give you the refund. https://support.xbox.com/en-GB/forms/request-a-refund. If the refund has already been denied, then chances are it will be denied again.

You can try responding to the email you received denying the refund to speak to a refund specialist, but if they deny it, there really isn't anything that can be done.

Phone/chat support no longer handle refunds, so talking to them most likely will not do anything good either. If the refund specialists denied the refund and you already tried emailing them and they denied it again, it's not going to get refunded.