VODACOM: Unsatisfying poor customer service

I'm with Vodacom for the past 18 years (cannot even remember for how long). I've upgraded my contract in September 2015 3 months before it expired. September 2017 Vodacom notified me that I can upgrade again. I went to the Rustenburg Vodacom shop to terminate my contract whereby they told me that I have to contact the Vodacom termination Dept. to do so. I've done that whereby they notified me that my contract only expired the 9 December 2017 and they can only logged it in the system a month before the contract end date. On the 8 November I visit the Rustenburg Vodacom branch and the Vodacom employee assisted me to give notice for cancellation by phoning them from the Vodacom shop cell phone. I still remember how I had an conversation with the Vodacom head office employee to why I have to pay a full installment for December 2017 if the contract already expired the 9 December 2017. I accepted his explanation and he promised me that the last installment will be for December 2017. Today the 30 January 2018 I went to the same Vodacom shop to make sure that my debit order has been stopped, that no funds will be deducted from my bank account when the employee notified me that my contract was not stopped but in a way the system cancelled the termination application. No mail, sms etc. to notified the customer... nothing... Once again the Vodacom shop employee are not authorized to do anything (not sure why they call it customer service if we have to phone all the time) and I have to phone the termination Vodacom number again. The Vodacom employee shared with me that even if my contract expired December 2017 they still continue with the contract if I did not cancelled it. And I cannot cancel the contract on the same day that I contacted them but only at the end of the month. What I understand is that if an contract expired the number must go to pay as you go or been terminated for no further use. On the 1 Feb 2018 my bank account will be deducted with an Vodacom debit order after I cancelled my contract a month before end date and I've done that through the Rustenburg Vodacom shop. The Vodacom system cannot say why the termination was cancelled, who did it (an username) or why? How many times do we as customers have to follow up on services to make sure that what we app**** for are captured, recorded and logged????? The head office employee send me an reference number for my call today and promised me that Vodacom will come back to me within 24 hrs. Sure, I have to see it to believe it. I need clarity on this and if they will reverse the debit amount back into my account and that my contract has been terminated.