Tried buying premium but wouldn't accept payment
This is not something that should be handled on the forum. Use the contact link on the main page.
Some bank cards mostly debit cards do not play well with out of country payments.
If you use prepaid credit cards that you can get in stores you will need to look on the card to see if they will work on foreign transaction.
Also you need to look and see if there is a charge for currency conversion and what is the conversion rate. Then if you are like me I have a text alert authorization for out of country purchase (a pin code is sent to my email and I then enter said pin code in the text msg sent by the bank on a 3 min time limit) .