screaming and shouting Edgars representitives

I have never in my life experienced this absolutely rude customer service in my life or have I ever been this harrassed by any company, today only there was 3 different calls from edgars representitives, the first phone call the man asked for my personal details and for safety purposes I asked him to give me the information he has and I will confirm if it is correct and he said it does not work like that and hung up the call, a second call where a woman called started with exactly the same questions and once again I do not feel comfortable giving my personal information to someone over the phone and she asked for the same she started screaming at me and asked me what was the last amount that I paid and I responded it was R400.00 and she shouted at me saying it is incorrect, and I told her I do have the proof of payment and she just kept on shouting that it is incorrect and hung up the call the third time a different woman called me and I told her two of her collgues also phoned me and they keep dropping the phone in my ear and her response was 'well this is not going to stop until I co-operate"... I have never told any of them that I am not willing to Co-operate, I just have one single request for me not to give my personal information over the phone and for them to give me the information that they have and I will confirm if it is correct, so for my own safety I am being shouted at and treated like garbage, for a big company like this it is really disgusting to know that they have representitives that treat your customers in this manner.