The caller is a scammer. They use email and text messaging to hide their thick foreign accent and imperfect knowledge of English.
Its the Over Payment scam. In that scam the scammer pays for the car by PayPal. The seller receives an email from PayPal that the payment has been made. That payment includes extra that you are to forward to a shipper selected by the buyer. The seller wires the overpayment to the shipper. Then the seller tries to get the buyer's payment from PayPal but discovers the money is not there. The email he received from PayPal was fake. The buyer cannot be found. The seller is out the shipping fee.