I had this happen to me. Way back in 2003 (before paypal and ebay had banned most gun parts) I sold a part for a rifle on ebay and paypal misunderstood what the part was because the buyer put the wrong description in the payment. He put the payment title as "assault rifle magazine". It wasn't for an assault rifle. It was a factory non-detachable mag for an SKS. It wasn't, but no amount of explaining would undo what the buyer wrote. Ebay was fine with it, it wasn't against their rules (which were the SAME as paypal).
So what paypal did first was send the money back to the guy who bought the part (3 days after the payment was accepted, AFTER I ALREADY SHIPPED IT). So I was out the part and the shipping cost. Then they froze all the funds from my business that were in my paypal account for 180 days. This was enough to pretty much put my online car parts business OUT of business, and I had to scratch the money together to ship about 10 more pending orders out of my personal funds (which weren't much at the time). They also banned me from paypal for LIFE, and refused to delete my personal information they had stored in my paypal account (including bank account numbers), and refused to allow me to reset my password or delete my account. I was able to request a check for the account balance after the 180 days were up.
Unable to accept paypal on ebay or on my website, my business completely died. People on ebay don't want to send money orders anymore. I tried several other online payment services, but people just didn't trust them or refused to sign up for them since they already used paypal.
Fast forward to 2009...
I called paypal and told them I wanted to use their service again, because it was the online "standard", but was banned for breaking their user agreement. I didn't get into my feelings about being banned. They reinstated my account, just like that. All I had to do was click a thing that said I wouldn't break the rules again upon logging into my account.
Yeah. So... the moral here is don't store money in your paypal account OR any bank account attached to it. I now have a separate bank account JUST for linking to my paypal account. Also, don't sell anything that's even close to breaking their user agreement. Which is a BROAD range of things. You'd be surprised what they don't allow. Read the user agreement is you haven't.
I still hate paypal and avoid using them if I can.