rudest agents ever.

I have stopped my debit order for finchoice as they simply debited my account on different days to what I have agreed on without contacting me. I then arranged to make payment via EFT, which I have done. TODAY however I have had 12 calls from their agents and the one a damn rude as the other about payment and the more I try to explain that the transfer was done and that they need to confirm on their bank statements the less I get into their heads.Are the agents trained to be rude to me because I am white?They do not listen,do not give me the opportunity to finish what I am saying and raise their voices. I eventually lost it as well and shouted back. I have ALWAYS managed my accounts properly and do have a very good credit rating and I certainly do not need to be treated like this by anybody.I will NEVER use their services again.