Doubly charged after purchasing a device from MyO2 app

[Kleo]

I have purchased recently a device from myO2. Whilst I was reviewing my details I noticed a mistake in my address and in order to correct it the system brought me some steps back in the procedure and asked me again for my payment details. In the end, I received a confirmation that I purchased only one device -as wanted- but I was charged twice. I am desperately trying to find a customer line services to address my issue but all I get is only pages not working. Any advice?

[Bambino]

@Kleo All available numbers are in the link below.
https://community.o2.co.uk/t5/Other-Products-and-Services/Coronavirus-Covid-19-Community-Help-and-Su...

[jonsie]

Try any number and choose any option from this link @Kleo 

Guide: Coronavirus Community Help and Support 

[MI5]

@Kleo 

Try calling 202 and speak to upgrades.

Other numbers here Guide: Coronavirus Community Help and Support