FaceApp Double-Charged Two Email Accounts on the Same Android Phone

While using the FaceApp app on my Android phone, subscription fees were charged through two different email addresses registered on the same device. I was billed approximately $28 in May and another $28 in June, bringing my total to $55 across both charges.
Because two separate email accounts were set up on the same phone, FaceApp appears to have charged each account individually. After noticing this, I reached out to FaceApp's support team but have received absolutely no response to date.
I only want and need a single subscription, and I am demanding a refund of the duplicate charge. I am requesting that the overpayment be reviewed and returned to me as soon as possible.