Pathetic bank

My car payment is up to date, not a cent in arrears. My debit date is the 1st of the month, for the last 4 years. Due to my late income payment, of 1 day, I paid my instalment on Saturday, 02 July, on the weekend. Monday 1 July I get a call from this greedy bank asking me why payment wasn't made on time, asking me about the way forward into paying the vehicle which only have one more payment left to completion. It is unacceptable for a bank to call you about payments on your vehicle when you are not in arrears. It shows their insecurities and inabilities. I will never buy a car through Wesbank ever again. They add things to your payment, and cannot explain to you what it is. Their customer services sucks.