Phplist.com Upgrade Problem

Hi,

I tried multiple times to upgrade my free account to paid account in phplist.com
but all failed.

I’ve tried using 3 different cards, switching browsers (even private mode), and also tried using paypal,
but unfortunately all can’t get through.

Anyone experience similar situation like me?

Any suggestion?

I contacted the support but it seems there’s no solution.

Regards,
john