Did you try here?: https://support.atlassian.com/contact/
For 'What can we help you with?', pick Billing, payments and pricing.
And for 'Select a topic', pick Can't find invoices.
This will give you a helpful button:
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You need to explain which bill or invoice you are looking for, and why you are not able to get it from your "my Atlassian account", where they are stored.
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