The telephone number 1 805 621 7128 is associated with a scam Paypal invoice being sent to potential victims in the United States. This is a fraudulent scam email. If you receive an email featuring an invoice from PayPal and the number 1 805 621 7128, the you should delete the email and block the sender.
These scam PayPal invoices are an attempt to take advantage of the ease with which PayPal account holders can manage their accounts online. By sneaking this email out to thousands, if not millions of recipients, the scammers hope that some business people and individuals will be busy enough to make payment without checking the credentials of the sender.
In this case the scam is pretty obvious upon examination. For a start the email has not come from Paypal, and the website associated with the scam is not the real PayPal site. We should also be aware that the invoice number GAGD8766N is not a typical PayPal invoice.
The best giveaway that this is a scam is that the phone number provided is 1 (805) 621-7128. This is not the Paypal Support number.