Harassed today by Woolworths to pay store account after I paid thru app yjesterday. Only has to be paid by 7th April.

Keep on getting harassed by woolworths to pay R505 on my store card. Used the app yesterday and followed the instructions to pay the R505. It was paid but NO option for immediate payment. Only had to pay by 7th. Why can't they wait till After the 7th instead of harassing me today to pay after I already have?