Why O2 haven't deducted my monthly payment with my HSBC Direct Debit yet?

[praschai]

In this second bill, why O2 haven't deducted my monthly payment with my HSBC Direct Debit yet? The first bill I paid by my debit card. perhaps it disrupted the system?

It's quite difficult to get through  to o2. I'm not sure why you have to keep asking me security questions? I might have forgotten them . Can I change or edit this? Otherwise I will never be able to get help by the phone.

[MI5]

@praschai 

You can change your security question in your MyO2 under edit your personal details.

For billing issues, 

You can get in touch with Payment Management team on 0800 902 0217

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Monday to Friday – 8am to 8pm

Saturday – 8am to 6pm

Sunday – 9am to 6pm

Guide: How to Pay Your Bill (Contract)