Wrong to no guidance for months on payment

Vodacom has bot been debiting my account and after inquiring about it since the day I opened my account, they now want to pin it on me. I have been asking them for over 3 months why my debit does not run and every time they have something to say. First it was that the pro rata fell on a non banking day (so I paid in store) then they said I paid upfront so they couldn't debit. Then the next month they said it will fall on the next month. Now they say that they did try to collect the previous month (the previous month where they said it will fall on the next month) but it did not go through (on my bank statements there is no indication that they even tried to deduct and why would the consultants say everything is fine if it wasn't) and now another month where they did not deduct. And instead of fixing the debit order from their side (as I have asked since the first time I saw an issue) they now say I need to pay from my end. I just want the debit order to run. Now I'm in arrears and it's my credit report that is affected, but they want to pin it on the person asking for guidanance from the 1st month. Also, why don't you give reference numbers anymore. It's because you know you lie.