Electricity key not working

I switched to bulb, the switched was due Thursday 25th. I waited till my credit was 1 pounds friday night. I inserted the new key but it is not working…error b2.
I tried the old key from my previous supplier, not working.
Weekend with no electricity, lots of meals out, lots of food being thrown away from fridge and freezer.
No any help over weekend…I wanted to cry! It is a nightmare. Hope to sort out tomorrow while.I am working…so scare to have.another day like this