Vodacom withholds voice recording

I have been trying to solve a major problem with Vodacom billing. On Friday the 10th of December 2021, I contacted them and the first person had to hand me over to the second one called Phiso/Sifo. She was very nice but couldn't help me much really. In fact come to think of it, she didn't help me at all. I insisted on a voice recording as there is what is a lot of money at stake. In the end she assured me that they would contact me within 72 hours with the recording. It is now Thu, December 2021. My calls on Friday took place mid morning so 72 hours have come and gone and not a peep from Vodacom. Should I not have communication from you ( voice recording as requested included ) from you by 17:00 Fri 17th of Dec 2021 , my next communication with you shall not be written by me. I am trying to solve this problem amicably.