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https://www.consumerfinance.gov/complaint/
File a complaint to get your account open. They doing it to everybody.
If your buyer files a dispute and wins then any funds in your balance that are owed to them will be returned to them without you having to issue a refund.
If there are no funds in your balance then paypal would repay them under their buyer protection policy so you don't need to worry about them not getting a refund.
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