Call Centre Consultants

I Received a sms from Groenewald & Lubbe stating that they have called me numerous times but I ignore their calls each time, just for record purpose I did not receive any calls. I immediately phoned them & then a lady at the call centre asked my Ref No which I gave to her, then she said If I do not make a payment they will be issuing summons immediately & wanted to confirm my residential address. I then made a payment arrangement with her but she demanded that they load a debit order which I feel is wrong because its my right as consumer to use any payment method as it suits me. She was very rude and kept on saying they will issue summons if they have no payment arrangement by 3pm that day... I eventually made a payment arrangement via debit order as they demanded. To my surprise they phoned me again today demanding payment & also again getting rude over the phone. Please teach the call centre agents some manners & guidelines how to work with their clients.