Make sure you gave them the right email address. If it doesn't exactly match the address you use with paypal, then they may have sent you money via paypal, but paypal can't get it to you. This can result in some strange messages.
I used to be a gold seller on ebay and we used to see problems like this all the time.
To avoid phishing scams regarding this:
1. DO NOT click on any link
2. Log into your shopperview account and check your email address. Make sure, for example, that you don't have a comma where there should be a period or you don't have a 1 when it should be a capital I. <<<<------------------- This is the most important thing you can do
3. Log into your paypal account by typing paypal.com and see if you have any messages. This is unlikely, but worth checking.