I have been trying to redeem the USD25 but couldn't get it till now, after attempting the method suggested here by using 4 different credit card, the result were two of my credit card got charged for USD1 and another one USD3!

21-Sep-2012 PREAUTH SALE GOOGLE *MARKETPLACE\\GOOG DATED 21/09/12 US$1.00 RM1.02

I wonder what went wrong during my process, i rather not have the USD25 if google is going to charge me for it.