Xbox series S pre-order

Need some help guys

I pre-ordered an Xbox series S using microsoft account credit. I no longer want the console (have decided to go for a series X later on instead), but on my order history there is no option to cancel. I have contacted the microsoft store support hotline but
they cannot help me, they said they can’t cancel the order because it has been reserved for me or something?

I am so confused - why can’t I cancel a pre order that is due to be shipped in more than a month?

Can someone advise me to who I can speak with - I tried contacting Xbox Support on twitter but have received no response sadly.

:)