Think before getting a woolworths account

Being a few days late (5 that includes a weekend when I was away) with a payment on my woolworths card (after paying on time monthly in the past) I get bombed with phone calls from agents who is ill mannered and does not have a little bit of professional ethics seeing as you are bothering me at my work. But don't bother complaining as they say they will look into it but once that phone rings again you get the same service and experience as before, and when pointing it out they do not apologize, just thank you goodbye. So whats the point in even having a complaints department seeing as they do not bother with complaints and clearly not bothered on quality customer service.