The Amazon/Paypal/etc refund scam is particularly devious in that they want access to your PC and then to your bank account. They pretend to give you a refund into your bank account by doing an internal transfer and then editing the HTML of the page to make it look like they gave you too much money. They can clean out your account of whatever you have in there.
Never let anyone access your computer, that you do not know, and never log into your bank account while anyone is having a remote access to your PC.
And never call the number on a text or email that purports to be from Amazon, Paypal, your bank, etc. Look up the number yourself and call directly. Stay safe.