Vodacom might as well employ robots

I’ve been with vodacom for more than 10yrs if which I pay my account every month on the 10th. I get sms I’m in arrears... I called collections the morning to inform them that on the 10th I will make payment. Late afternoon my lines are cut. I called customer care who activated my lines which lasted for 15 minutes. I called again last night and the lady said that even if I notify of a payment my lines will be cut. I just don’t understand why is it a problem when I’ve been a customer for 10years paying on the 10th as my salary gets paid on the 7th.