PayPal

I sold a phone via PayPal on the 30 Nov 2022. I requested the amount of 423.50 usd from the buyer Khanyisile Mahlangu who resides in Kempton Park. PayPal wanted proof courier which I did via Postnet in Potchefstroom which cost me R200. After the documentation was verified by PayPal I was to receive my money. The buyer received the shipment 01 December 2022 delivered to the address. Yestday I received a email from PayPal at 2.18pm say they sorry for the delay but the money will be deposited into my PayPal account. At about 9pm that same night I received a email from PayPal saying my funds are being with held due to an excess that was paid into my PayPal account by the buyer by mistake. Up until now I have not received any money. I need desperate advice on how to retrieve my goods or money as PayPal does not respond and no one that has authority calls you back. I would to get this matter resolved asap as I'm a pensioner and loose the phone and the money. Would appreciate if anyone can help me please.