Contacting Voicemail 901 doesn't work & Is Contacting Customer Service Free?

[Classicus]

Hello.

I use O2 from Saudi Arabia.  I get numerous notifgications about voicemail. However when I contact 901 the line is immediately disconnected.  I don't hear anything.

My balance was £8.50. I contacted Customer Service to explain the situation.  The lady told me that this call is FREE and spent 3 minutes trying to sort it out without success.  A notification was displayed stating that my balance is low.  Another notification shortly afterward said your balance is £0.00.

What is happening, please?  
1. Is it free to contact Customer Service 4445?
2. How can I contact Voicemail to listen to messages?

[MI5 · Accepted solution]

@Classicus 

See guide here Guide: All you need to know about O2 Voicemail 901 

Call charges are here https://www.o2.co.uk/international/using-your-phone-abroad 

Calling O2 on +44 7860 980 202 is free from abroad.

[Classicus]

MI5,
Thank you for your previous reply.  Two points:-

1) Calling O2 on +44 7860 980 202 is * NOT * free.

2) The links you suggested are useful but they contain a whole jungle of information.  I am still struggling with "voicemail". 

A simple question, please:   Is calling Customer Service on o2 0445 free or not?

[MI5]

@Classicus 

Simple answer is yes

4445 is free if it connects from abroad.

+44 7860 980 202 is free from your O2 phone only.

[Classicus]

  MI5,
Thank you for your response.  I appreciate your help. 
However, when I try +44 7860 980 202 via O2, I hear a message about topping up!

[Enlli]

Regretfully, leaving your answerphone connected while in Saudi is a costly mistake as you are going to pay for any calls returned there whether a message is left or not.

Although the O2 numbers quoted are free you may not be able to call them if your balance is zero

[MI5]

[Classicus]

  Enlli.
Thanks for your input.
Actually I haven't received any calls.  To test Voicemail, I phoned my UK number from a local phone and left a message.  I have since tried many times to dial 901 to see how it works.  Immediately after 901 is dialed the line gets disconnected and I didn't get to press * or whatever.  I have been receiving "Alerting Notifications" several times on a daily basis.  To stop these notifications, I need to dial 901, listen to the message I left and then delete it.
So, I can neither dial 901 nor stop the notifications.  The balance is sufficient.

There is no wish to prolong this inquiry.  Apologies for bothering you with this.