Dear forumers,
i am now selling Sony mp3 players in music and related accessories site,

case a
i wonder if a buyer makes a fake online transaction receipt but i didnt receive the money at all, how to prove that i am innocent?
and how to face this kind of problem as a seller?

case b
similar to case a
a buyer register two new account in LYN and uses both the two account to buy items from me.
both of the new "members" bank the money at the same time and sms me that "they" have banked the money in,
but after i check my account balance, i got only 1 unit payment.
and both of "them" do have the paying slip,
supposing one of the paying slip is fake one,
how can i prove it?
and how to solve it?

that's really great to get your advices,
thanks a lot...

yaya, thanks a lot for your suggestions, precious.
now i have a question,
in the case such as inter-bank (such as public to maybank)transaction,
would it be delay for few hours or few days?
because just a customer sms me that he had transacted the money,
but i check through my online account service, it shows that i dont receive the payment yet...

he bank the money in this morning at 9:15,
but now i still not receive the amount yet

ok, thanks...
now only i relieve after getting that info.