Patient First review: Unauthorised credit card charge

I was in the Patient First hospital on 28th January 2020. I had insurance that should have covered all the costs.
I haven't heard since until now.
Today, on 26th January 2021, almost a year from the visit I got charged on my credit card. There was no bill or anything. I have no idea what was I billed for.
I'm requesting to refund the unauthorised Credit Card charge.

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