I think you 'really' won a price! They can't do anything with your account number.......(it is written on any checck you write out anyway)I also had one encounter few months back;
A lady called me to attend an opening celebration in JB on Sunday afternoon, I told them I am not going, and on that sunday afternoon, they called me on my mobile, telling me that I strike a lucky draw, asked me to go down to JB immediately (an address was given), I told them never mind, forget about it.
Then next monday, one lady called me again, telling me that the lucky draw I won was$200,000 dollars, since I was not there to collect the cash, they can send the money to my bank account, but they need to verify my particular, so she said she need full detail from me: My name, IC number, DOB and Bank account number. They will then transfer the money to my bank.
I asked them to donate this money to charity on my behalf, and that lady was very angry, scolding me for why I don't believe her, I told her nevermind, I don't need the money, and I sincerely want to donate the money to charity, and hung up the phone.
Still wandeling, what can they do with my information, but whatever it is, it is better be save then sorry and don't be greedy.
HS