Month-to Month Contract- Running a bill instead!

I signed a month-to-month Fibre contract with Vodacom and choosing that specifically in case I have issues with affordability some months. When it came to the second month I could not make a payment and my Wifi should've been switched off... but instead Vodacom started running a bill. I called in immediately to rectify but nothing was done. The consultant did not give me a reference number. Then the 3rd month came and now my Bill is over R3000 which should not be the case seeing that it is a month-to-month contract. I was told by one of your consultants that they cannot assist the previous consultant did not log the call or give me a reference. I cannot afford to pay over R3000 for a bill that wasn't suppose to be running in the first place, just to get my internet back up. It has been 3 months and no one from Vodacom has gotten back to me to sort out this issue. This is really pathetic and unfair treatment from Vodacom! You should stick to the contracts your clients are signing... not running bills and doing nothing about it!