Barko Loans humiliation at the workplace

I recently visited a branch in Centurion to apply for a loan. I was being assisted by Dreshni and she said I need to borrow for 3 consecutive months before they can increase my amount that I qualify for. I then paid back all my installments on time. With the fourth loan, I encountered financial problems and couldn't pay on time. This is where the harassment started. Dreshni kept on calling manager at work asking to speak to me, I told her to stop doing that yet she continued. She then went on to tell me that my non payment is affecting her salary. I then went into the branch to make a payment arrangement. Shortly after that, I received a sms from Dreshni saying that if I don't pay the full outstanding amount by the end of this month she will humiliate me at my workplace. What kind of a registered financial provider is this who threatens people by saying they are going to humiliate them at work? I am going to escalate this matter to higher authorities.