On Air tv debit order a disappointment

I am really disappointed with On Air DSTV,i bought an explorer via On Air and the agreement was that the debit order will go through on the 30th of everymonth.Now from December they are loading their debit order early when i am not even paid and they claim a missed payment which they eventually get on the 30th,i now have 4missed payments on my credit score which is all not true,i called to rectify that with them,but they are just continuing with early debits,i am really frustrated.I tried very hard to remove the missed payment i had on my credit score which they did not help me much with after several calls,to my surprise today i am checking my score and i have 3more missed payments.