Vodacom Upgrade Nightmare

Did an upgrade in January to one of Vodacom's double deals and were excited once we received the phones we started setting it up so that we can use them, one device worked perfect the other device had a mic problem (people cant hear you when you call them of being called) no biggie we will ask Vodacom to fix the device and problem solved. WELL that is not the case. Vodacom did come and pickup the device, next thing Vodacom said we were suppose to send both devices back in order for them to exchange the phone. (does not make sense) We have explained millions of times that we can not send the other device back as we already got rid of the old device and won't have a device to do my work. keep in mind this is still early in January 2026. Vodacom insists that they need the other device so that they can cancel the upgrade and then re upgrade me in order to get the devices again (make it make sense please) this process will take 2 weeks + by my calculations which means I must sit without a device for that time. No there is the other side of the problem it is the 19 February 2026, we have asked Vodacom to send a letter stating the exact reason/s as to why they need the other device before they can do anything, as we just want the faulty device fix. Have also requested where it says in the terms and conditions that you need to send back both devices in order to fix one. I have read through all the terms and conditions , Online sales terms and conditions, deals terms and conditions, Vodacom's general terms and conditions, Contract terms and conditions and no where does it states that I need to send all devices back. It does state however "Device". only thing that online sales keep on telling me is that I were suppose to have send both devices back when we were not told that we were suppose to send both back. (If we knew that we must send back both devices we would have raised the problem of having got rid of the old device and that we can not send both back. Now we were fed up with this and we said ok just send us the phone back and we will fix it at our own costs so that we can give other device to my child as this was suppose to be her birthday gift on the 24 February, Just to be told that they cant send the faulty device back either. My wife is in tears and more stressed because of this.