Phone call from hell

I just received a phone call from a representative of RCS for Dion Wired. Last month I made an arrangement to pay an amount on my account. I made the payment on 29 February 2016, it could have reflected late on their systems, as I was questioned as to why I paid on 1 March 2016, he wanted to know what my problem was. I was then told I short paid and needed to pay today, but I raised the previous arrangement made. He told me he did not care about previous calls, I need to focus on his call and I needed to keep quiet while he spoke. I was humiliated on the phone, belittled and threatened with my account being handed over, no matter of any arrangement I may have made prior to pay. I will put this all over social media and the internet, highly recommending everyone to stay away from RCS Group, this is no way to treat customers