Incompetence with billing and my details on bureau

I have a DPP account with Multichoice that i took out in Oct 2015. My debit order date was the 25th of the month. Because i got paid early in Dec 2015 i called the Multichoice call center early Dec to change my debit order date to the 15th Dec 2015. The debit order didn't go off for the month of in December, I called on 04 Jan 2016 to find out why the debit order didn't go off, I called @ 13:14 and spoke to Dimples with ***-I38 and she confirmed that the reason the debit order didn't go off is because there is no outstanding amount, I called a few weeks after just to find out that i was given the incorrect details, I then made manual payments for Jan and Feb and march. The debit order only went off on the 25 March 2016 after numerous calls and queries with your call center, To top it all off you guys have updated my credit record on the credit bureau negatively and its reflecting that i am in arrears by 2 months. I want my credit record updated accordingly as i have been making payment every month. It was your billing department and call center staff negligence that messed up my debit order. Please rectify this and revert with feedback very soon.