Ok guys.. After searching all over the net for a fix to not being able to buy stuff from psn on both my vita and ps3, I found something that fixed it. What I had to do was re-enter my billing address in a strange way.. I live in a apartment so I had to enter my street address as well as apartment number on line one, then on line two I entered my city... Which who would think to put their city on line two considering there is already a section for city on its own. So basically it looked something like this (line 1 - xxxx street ave apartment xxx) followed by (line 2- your city). It's funny seeing your city twice on the same page but it worked and I can now purchase things on my vita / ps3 without that stupid 800 whatever error and the Nff yada yada crap. Sorry it this is written badly. I'm on my iPad. Just wanted to help ppl out.
Good idea/effort, but still hasn't worked for me. Haven't been able to add funds to my PSN account for at least 2 years actually. Have to resort to buying PSN cards (online, at an inflated price, cause not available in my area).