FastVoip promo code to get 25% extra free credit for new or existing users

Trying to buy credit from fastvoip, then you can use promo code free9call12 to get 25% free credit. It means if you buy 10 EUR credit you get 12.5 EUR credit.
How to use this promo code?
From my account area: Buy credit, select the payment method among Visa, Bank transfer, American Express, Mastercard, CashU or PayPal.

Then use this FastVOIP promo code: free9call12
This promo code  is Valid