Keep getting a message saying to contact Microsoft support anytime I try to make a purchase...

I think this is an issue that others are having also. The best way to contact support is to request a call back.

The best way to reach Live Support would be here:
https://support.xbox.com/contact-us

Step 1 ----Select Xbox One

Step 2 ----Select See other options

Step 3 ----Select topic (Ex. System Update)

Step 4 ----Select "Show contact options"

Step 5 ----Select request a call from support

Hi

What region are you in?

Hi there,

you can fill out the form here and the Support team will give you a call. Yes, it will be a real person. You can this here: https://support.microsoft.com/en-us

i have contacted Microsoft support 10 times today, i keep getting transferred around, ive now been told i need to talk to "post sales" but its a internal number and anytime they transfer me i get the "were closed" message