Vodacom **** service providers

This ****ty phone service provider, I missed a payment on February R854 They debited me twice on the first of March R1808,88 which I understand. I then called them to change my debit order date from the 1st of every month to the 25th of every month, which means my next debit order was supposed to be on the 25th of April. Now today 27th of March they have debited me again R1147.93 ? Why ? I call the customer service I speak to Kiki Monareng he is also as confused as I am he puts me on hold for more than 4 times trying to get an explanation but still nothing he keeps stuttering with no clarity, he tells me it’s the charges for their service which service is for R1143,93 ? This is bull**** I want my money back.