My ps3 has just been hacked then I received this message:

"A nasty little hacker by the name of KILLA_KIWI has discovered a new exploit for the PS3 similar to a virus. Problems start when you join a game with KILLA_KIWI or a chat room. Shortly after your PS3 will freeze regularly and display the error "hard drive corrupt" It is still unknown how KK hacks the PS3 but we think he is using a custom program through Linux. Numerous accounts have been hacked and credit csard details stolen."

I was playing MAG and this KILLA_KIWI was in my squad. AFter 10 mins my PS3 froze up so I restarted then got the message above. I then checked my credit card and $300 dollars had been spent on PSN all in the space of about 30 mins.
Is this a problem with MAG?
As you can imagine I am really ticked off