Discounted pricing offer never followed through. #Disappointed in Vodacom service

on 23 April I received a call from Michael offering me better pricing on my 2 contract (072367***x) down to R999 and (083655***x) down to R229 by adjusting the 083 number's data contract to a smaller package. When 01 May debit went off no pricing change was reflected so I called the *** number, Michael said I should call this nr, this time I spoke to Jewel Rigby on 07 May 14:10 who knew nothing about the better pricing offer for the two contracts. I told him I want a copy of the recording of the conversation of 23 April 09:36, Jewel stated he was requesting it for me. Nothing has come through as yet, 2 weeks on, and this Michael dude has disappeared. BTW on the call of 23 April Michael offered me a 5G router for R40pm. What came was a 4G router and an invoice from Vodacom. So, my question is why you employ rogue agents offering discounts which never reflect. This equates to false marketing in the highest order.