How do I cancel my account and receive a refund for annual membership paid?

I’d like to cancel my account and get a refund for the unused portion of my annual membership.  I have removed payment info from my account.  How do I get a refund?  

Zwift is a monthly subscription so I’m curious to how you have an annual membership in the first place?

Sorry, my mistake.  I recalled (incorrectly) paying an annual membership.