All I can suggest is, what I and millions of other trouble-free users do, and that is transfer any payments to you from your paypal account into your bank account asap.

Unsolicited payment from an unknown person? Thats a scam that gets taught in primary school and all they are after is refund of the payemnt which was probably from a stolen credit card in the first place. I've had a couple of these and just refered them to Paypal who removed the transaction. Same thing happens in banks as well.

if they let you transfer your funds to your bank that is all well and good. sadly, as hundreds of thousands of long time users have eventually found out to their cost, this is not always possible because paypal hold up the transaction then suspend the account. they build in delays i believe, so they can earn interest on your funds. as for removing scam transactions, you have the likes of me (and the now defunct fsa in the uk) to thank for that. i was one of the original users of paypal, when they were only really available to users within the united states or to users doing business within the united states, and when they suspended my account, rudely refusing to refund the payment or get the bank or police or fbi involved, i kicked up a stink, and threatened to do so myself, through my friends in US law enforcement. eventually i got my account restored and the funds removed. now of course, they might have a procedure in place. you notice paypal left the uk pretty sharpish after a short period of proper regulation was imposed on them.

i feel to add my experience in here.

i have coded software for the banking 'industry' which i now see is more appropriately identified as a 'parasitical distraction from actual reality' and 'a fruit born of seeds made of self-doubt, denial and false promise'.

to learn more about 'what money is' you could view the page i have prepared on my site here:
money is fake - a katalist.

even though i do not desire to use money at all and have been quite successful in doing so for a few years here - i do still use money for purposes of hosting my elgg site and so added the donation plugin to my site. i updated the code to support bitcoin and now also 'flattr' - both of which are simple code changes.

bitcoin totally bypasses the banking system and centrally controlled monetary institutions so in that sense it is quite useful - however, it also has built-in flaws because if you have the bigger computing setup you can actually create your own currency at a faster rate than others.. so it is possibly actually dangerous to the planet since if everyone used it there would be a type of 'arms race' explosion of creation and use of technology even more than there already has been - which the child slave mineral miners of the african region and the slave-wage factory workers in other areas would not ultimately benefit from..

obviously this is a vast topic and one that requires vast change from the heart for life to improve.