Worse service and money hungry idiots

Good day. I sign a contract with vodacom online a cellphone contract for 36months x2phones.they have change the amounts as they felt fit to do so upon multiple occasions I send emails asking to explain in detail where it comes from and a print out to show detail up until now I haven't receive .I requested a copy of my contract they didn't assist me up till today this is the Most pathetic service one could ever experience I have phone my bank to cancel my debit order until they explain to me why all of this amounts every month was different and it is not even a prepaid contract no one takes interest in this matter and so will I.im ready to take legal action against vodacom and will make it public social media and news papers