Hi Bhai,
Doesn't the mail that asks you to pay RPRF, mention exactly how you should pay it? One lucky person told me that he was instructed specifically to pay RPRF online and SGVO told him the procedure. If they mention that RPRF should be paid with a DD (demand draft) then you will have to go to Standard Chartered. How to get a DD from Standard Chartered is a separate chapter of discussion because they ask you for a long list of supporting documents. This forum has details on that.
Please read the mail again to see if you have been instructed along with a procedure to pay RPRF in a particular way, and please do let us know.