I've never ever suffered from a service this much! 2015 is the worst FF14 year in my life

1-I've started to get this 406 or 400-sth error message when I try to use my credit card although it worked well before & still works well in other websites!

2-Then I moved to buy crysta using paypal as I was told by SE and it worked at first, but now I only get this message



And nothing is added!!

3-Time card codes from amazon.com don't work (as people I got from people's complaints there) & I honestly don't want to get 60 days subscriptions each time I renew cause I'm not sure whether I can play this long without taking breaks -_-"

What should I do now?

Is it because I, and my siblings, share the same credit card & paypal account that SE prohibits us from using in more than 1 Sqaure account? Cause the problems always start with the 2nd or 3rd payment in an other account!