Cell C incompetency

According to Cell C I'm R1003 in arrears my next debit order is only due on 6 January now the demand that I must pay the R1003 how dam *********** must you be to jot see that my debit order for December was paid and on 24 November I paid R150.00 and send them numerous proof of payment but they are so *********** that they can't allocate the R150.00 that I paid every time they try to take the money that I don't owe them and the debt order is returned they charge me R70.00 so I have to pay for their incompetency I effect they ***** money from me and how many other clients this is ridiculous I had enough of this ****