Disgusting call centre agent

I had a very disgustingly rude lady that phoned me around 12h20 I know I have a outstanding amount with Norman however this amount was paid my things are paid monthly I did not miss a payment but this company will harass you every single week and call u every single week just to talk however they lack the courtesy of sending u a updated invoice to show how much more is outstanding because if your payment is up to date and they get more money it suits them the lady I spoke to was exceptionally rude and shouldn’t be working with upset clients obviously I’m going to be upset if everytime my phone rings it’s Norman’s calling for no reason why am I being harassed if I pay my account as agreed send me my stuff and leave me alone and get this woman off a phone