Over charging and refusing to fix their compay error

I am on a compact subcription and I pay R449 a month, a family member had incorrectly payed on my account R1500 and my DSTV account was on credit and I noticed this on the 1st of May when I went to pay my account, I therefor contacted the family member and we were on a confrence call with the call center agent who did a refund of R1000 and the R500 had gone towards my monthly subcription which was fine on the 25th of May Multichoice disconnect my services and said I need to pay R155 I called the call center where my calls where being dropped I gave gave up and went and payed the R155 and my service was back up. On the 1st of June another bill was generated of R469 which this was my bill for the month of June on the 5th of June i got a text saying that the amount of R1500 was declined (I have never set up a debit order with them) and the service was diconnected for the amount of R1175 I didnt undersatnd this how can a compact service with no extras be this much and I had already paid my monthly bill for June. I have found the service within the call center beyond poor the agents are rude the call avoidance is beyond me (mind this is a chargble call) the few agents that I managed to speak to and get some information told me that there was a refund that was done of R1091 (which was fine) and another charge of R1500 was created on my account NOONE can explain to be why they will charge a DSTV account that has a sub of R449 with these insane amounts where all we wanted was a refund and the account to be back in order the managers in that contact center do not want to take an escalation and this company refuses to fix and error that was clearly created by them not today they told me that thedont know why the system has charged me this account but i have to pay it and I have no service