Unprofessional, rude VeriCred Collections Consultant

I would like to lodge a complaint against this company and their unprofessional, rude consultant. I have hospital accounts of which I'm starting to question as well due to their inconsistent and unprofessional handling of it all. Today I received a call from a lady consultant and I told her I was busy in a meeting then she proceeded to say "WENA you like to drop calls" I told not to call me that but she continued with ïsn't obvious I just called you that" then dropped the call.

For more than a month I've been answering their calls and communicating with them to start a payment this month to finish one account. I didn't receive any SMS with account details at first then when they did it was the different account and I was confused which one to pay. On Thursday I was in contact with one consulted who told me he would call back and let me know which account to pay, however, the call was not ever returned. I want to finish paying all these accounts before affecting my credit.