What can i say useless

Never ever in my life have i dealt with people so narrow minded.. Firstly they don't have any telephone manners, can't understand a word they are saying and secondly have no idea on how to do their job.. They don't know the first thing on how debt collecting word and the rules and the laws that come with it.. They are phoning me for and outstanding Standard Bank Credit Card. Every time a different consultant phones regarding the account.. After the 50th phone call from different people i asked the consultant on how many people works with this account, i was told between 10 and 15.. Am i just stupid or ***********, but aren't you suppose to make notes on the system after speaking to the suppose to client.. When i asked for proof on this account on how they came to the amount and interest added, i was told that they are not allowed to supply me that information.. According to my knowledge when debt gets handed over everything last thing must be in that file.. You can't supply me with a breakdown of account cause Standard Bank does not have that info anymore, so they are wanting for me to pay an account with a random thumb sug figure.. I can't deal with this people anymore.. Phoning me 6 to 7 times a day.. Im a pensioner and i am not well, need to go for a hip replacement and the i get told to go and sort out my own statement for Standard Bank