MBD ********!!!

MBD is a ****, one of my accounts was handed over to them, they sent me a link which showed my account details and how much is due, so on the 20th of April i accessed the link and paid an amount of 2300+ which i got from their link, i fully paid that account on the 21st of April then called them two days later because i wanted to send them proof of payment, spoke to a dumb consultant named Nokuthula who said she will send me an email so that i can send my proof of payment to their email address, i waited till this day no email sent. All of a sudden i get calls from their consultants but as usual when one answers then there is no one on line, so i called back before end of April to ask why are they contacting me after I've fully paid my account and the consultant who answered said she doesn't know cause she sees that a payment has been made but will ask them to call me back, so today i get a call from them which i answer then a rude consultant tells me i owe them R300, R300 for what cause i paid the full outstanding amount which i got from their link which they said i owed. Now they are trying to milk extra money from me and how can one owe an extra R300 within a space of two weeks or so after the account has been settled. I will not pay that amount, if i was owing that then they should've sent me that full amount including that R300 when i paid mid April. These people are ******** and are ready to milk customers for their money. I did not make up the amount i owed, i got it from a link they sent me but now they are bull****ting me. MBD should be ashamed of themselves!