Pathetic service

I wrote an email on 26/04/2018, which was almost 3 weeks ago in an attempt to pay up my Coricraft account. Calling their customer service is simply a waste of time because a client will hold for 30+ minutes without any response. Finally, I managed to go to Coricraft Brooklyn branch to make the payment manually on 05/05/2018, only to have their systems down. To try and resolve this issue, I engaged with Coricraft for a full week ( 07/05/2018 week), since it is impossible to get hold of RCS, and I have correspondence to that effect. What infuriates more is that during this confusion, their agents were calling, threatening me. They were not even willing to listen that the payment has been made and there was a glitch to it being finalised. To my horror, the response of my email request came, with a demand that I immediately pay an extra R2500 on my outstanding amount, with no explanation whatsoever what that extra charge is for. I wrote to them requesting an explanation of all this, got a response that someone should be calling me. I am still waiting for that someone from RCS to call and resolve this issue. I must say this is the worst, most unprofessional customer service I ever got dealing with financial service institutions.