Update billing policy with refund denial reasons-policy.mdx (cloudflare#24281)

* Update billing-policy.mdx

* Aligning with style guide

---------

Co-authored-by: Denise Peña <[email protected]>

Author: travisgahn

src/content/docs/billing/billing-policy.mdx

@@ -107,8 +107,18 @@ To regain access, you must settle any outstanding balances and pass preauthoriza
 
 For assistance, visit our [Support Portal](https://support.cloudflare.com/hc/en-us) and submit a Billing request (category: “Payment issue”) to our Support team. They will assist you in verifying your updated payment information.
 
+## Non-refundable occurrences
+
+The following occurences cannot be refunded:
+
+- Billing or renewal issues: Often involves charges for renewals, unexpected billing, or issues related to subscription payments.
+- Accidental purchases of services and subscriptions: Includes instances where users bought the wrong service, made a mistake during the purchase process, or unintentionally upgraded their plan.
+- Domain issues: Incorrect domain registration, issues with domain transfers, or accidental domain purchases.
+- Service or plan issues: Issues with a service or plan itself, such as attempts to downgrade, cancel unused services, or problems with specific features.
+- Support issues: Unresolved support issues.
+
 ## Related resources
 
 * [Cloudflare Self-Serve Subscription Agreement](https://www.cloudflare.com/terms/)
 * [Understanding Cloudflare Invoices](/billing/invoices/)
-* [Understanding Cloudflare sales tax](/billing/sales-tax/)
+* [Understanding Cloudflare sales tax](/billing/sales-tax/)