Unable to provide me with an installment

I took the Pricelock plan with Multichoice on June, and the arrangement was that they will debit an amount of R549 on the 15 /07/2017.. To my surprise they did not. On August I waited for them to deduct still, they did not. I ended up paying at Pep Stores an amount of R600. After a few days my services were disconnected and I called them,asking for an arrangement of settling the amount that I owe for July (R821) and we reached an agreement of splitting it into 6 months inclusive of my Pricelock,(R549,R100 insurance. And for that agreement they told me that I can only pay by debit order. But my main problem is they don't debit and I have to constantly call them because they suspend services every . I don't know whether the consultants are battling with understanding the accounts statement or not. This is so tiring because everytime I have spend roughly R35 on airtime explaining the same issue over and over.