Is there a way to buy Crysta without credit card?

whatever my visa or master doesn't work on mog station,it always gives me a 601 error.
it drives me going crazy.
I want to do a world transfer!!!

Sadly the '601' error is a common problem with a million different causes and no particular solution. SE has a thread about the issue, found here (which has a lot of angry comments from players), along with some possible fixes.

One common cause for the error is the internet browser you're using may be running a security program that is interfering with the Mogstation when you try to enter your card details - Firefox with the Noscript and Adblock addons for example). If you're using a browser with such functions, disable them when accessing the Mogstation and hopefully it should now work (this is the only time I've ever gotten the 601 error and disabling Noscript fixed it).

But sadly, as I mentioned before that error code is a 'placeholder' that actually covers a multitude of sins which have no easy fix I'm afraid. Anyway, I really hope you can manage to solve this annoying issue.

I have tried IE,firefox and chrome,none of them worked.
I wonder whether each player who played FFXIV has a creadit card which knock on SE door? What can these players without it do?

I think I may be wrong but I think you can buy crysta with a RIXTY card which you can setup at rixty.com then top up your account with your mastercard for the amount ya wish then when ya goto buy crysta at square you choose pay with rixty option it will have ya login to rixty and will deduct that amount your choosing from your rixty balance...its a bit of back and forth but it w orks and as you spend money filling your rixty you get points with them and accrue enough and they give you free rixty cards as well. Very popular alternative way around issues like that. Just a suggestion.