Paypal — not paying the money

I have opened a PayPal account to receive money from my international customers against cross border goods trading.. after receiving my first payment on the Paypal account (amount of $2500USD) they permanently limited my account and not providing any reason.

I have successfully fulfilled the order within 10 days of receiving the payment and my customer is happy with the deal (there is no dispute at all) still PayPal is not releasing the money and it's been more than 5 months now am waiting, there is no response to the e-mail, and calls from Paypal.

please find attached screenshot