VODACOM!!!VODACOM!!! NO COMMUNICATION!!

I have been shoved from pillar to post with regards to my faulty device. I did the upgrade on 12 November 2018. However have been experiencing problems with the device, and logged the fault / call with Vodacom on 23 November 2018.12.04 The consultants I spoke to advised that because it is still within the 14 day period since phone was delivered, the device will have to be exchanged. So it was then agreed that the couriers "RAM" will, upon collection of the faulty device, provide me with a new device. However, this was not the case. The couriers were at my office only to collect the faulty device however I did not hand it to them, as the agreement / arrangement is that I should get a new device in exchange for the faulty one. I can not go without a phone as I use it at my place of work. And I explained this to all of the consultants I spoke with. Everyday , when calling 082 111 / 1945 / 135 / etc......... to follow up again.... Now there is no trace of any of my calls / complaints logged. I would like the upgrade to be reversed and my contract with Vodacom cancelled. I have now had enough of this nonsense.. Today I Spoke to Yvonne at the cancellations department, and she advised me that she has escalated this to her supervisor, as it has now been since 23 November 2018 that I first logged the issue on the device... but nobody knows anything about this... nobody can provide me with any reference numbers, because apparently nothing is done / captured on your system/s. So then a customer doesn't have a foot to stand on, if you don not even have record/s of any calls / problems / customer concerns logged... COME ON VODACOM.....!!!