My SIM card stopped working

Hi,
Yesterday my internet and mobile network stopped working.
I was able to fix the issue each time by removing & reinserting the SIM and then it would work again for a few hours.
But a few hours ago, it stopped working altogether. Even removing and reinserting the SIM doesn't fix the issue any more.
I have 2 working phones so I have also tested using the SIM in my other working phone today. There it also doesn't work - the SIM card is not detected, even though I used the SIM on this phone many times in the past.

So it seems for sure the SIM card has stopped working (it is pretty old) and I need to order a new one.
I went through your self-help menu and it told me to order a new SIM by logging into My Odido.
But when I try loggging in there, it goes through a 2F authetication step - sending an SMS to my phone - which does not work because my mobile network is not working! And you do not give an option to receive the code via whatsapp or another method.
Since I can't log in there, the tool gives me the option to order the SIM by phoning the service number (which is not open) or contacting this community.

Since this is the only way I can contact you, can you please order a replacement SIM for me ASAP? Type: nano SIM.
I need this quite urgently, once I leave the house, nobody has a way to contact me.
Thanks in advance!