Lack of business ethics and mismanagement of account!!

again less than 3 months that my query was resolved atleast that's what i thought another mess up is been done with my billing. Now DSTV claims i owe them R1800 when my package is R549 price lock with an arrangement of R1600 settled over 3 months due to their their ***** systems that just changed my debit order day mysteriously without my concern, now this still not correct the fact that they still charged me intrest while none of this was my fault and now this. i dare you to cut my service because of your mishaps i'm going to take this up with the omduds because this so unfair that you want to charge me exorbitant amounts and clearly no one audits this account to see if billing is done correctly. I want someone to come back to me today as i phoned your call center and i promised my query would be escalated and i would get feedback in 48hours unfortunately i cant wait that long.