Auto & General Insurance breach of contractual agreement

Good Day. Auto & General Insurance debited my account on the 18th of March 2023 for Comprehensive car & house hold contests. The agreement as per contract is that I'll be debited on the 20th of each month & with the 20th is public holiday then the next business day. As a result of their actions Auto & General has debited the last R1k I had in my account & I'm left with R2.39 at the moment. I called Auto & General to get refund on the 18th because I really need the money. I was informed that they are not in position to assist until Monday the 20th of March. Come the 20th of March it would be a fruitless exercise. How am I going to make it through the weekend wig R2.39 in my Account. Apologies are meaningless when the damage has been done.