Prepayment meter...key not working. Electric running out

I’ve been a customer for a few weeks and I’ve had a similar issue as this twice. My electric key isnt working to top up I’ve tried several pay points…my emergency credit wont go in the meter and I have 45p and obv I’ve just found out bulb arent around at weekends! So what am I meant to do…I have a disabled husband…have I really got to run out of electricity until 9am tlmorrow ?!