Hi @gusdors1
Welcome to the customers help customers Community of Vodafone.
The best thing you can do is contact Vodafone customer service. You can call them on 0800-0094 (Opening hours: Mon to Fri 08.00 - 20.00 / Sat 08.00 - 18.00). If you are calling from abroad, call +3106.5450.0100. These people can then make an appointment with you about your outstanding payment.
In addition, it is also possible to transfer the full amount to Vodafone from abroad:
IBAN: NL93 INGB 0007 9398 33
BIC (Swift Code): INGBNL2A
T.n.v. Vodafone Libertel B.V. in Maastricht
Notification: your own 06 number and customer number
(payment can only be made from a SEPA country, see here which countries these are)