Are you using a direct debit payment linked to a payment method? Then you get your calling credit immediately, but the money will be deducted from your bank account only 6 to 12 days later (this may take even longer in some cases). If we don't receive the money from your bank - for whatever reason - your remaining calling credit will be revoked. Your payment method will be blocked as well. What to do in that case? Read up on it here.