Upgrade issue, pathetic service!

I went for an upgrade at VODACOM on the 1-08-2025, after having the phones for less then 24 hours I returned them the very next day as myself and My wife experienced issues with them.i showed the Vodacom staff what the phone is doing, one of them even made a joke out of the brand , so clearly it's laughing stock,The manager took them back said he will send it back and will reverse the upgrade and then just redo for different devices, which he still states he's waiting on stock still for the devices we agreed on, and I was all fine with that, I have not received any feedback from Vodacom for almost three weeks, I had to keep phoning after them to hear what's happening, eventually I was told the 1 device they found an issue with, they will just replace 1 with the same model, I do not want a brand that came with issues out the box, I have been promised that I can go for a diffrent brand of phone, why lie and promise me in the first place and then change afterwards, they want to sell their **** and get rid of old dead stock. It's officially 3 weeks later now and I have signed for upgraded phones which I don't have and is still at Vodacom, I have been with Vodacom for over 10 years and has multiple contracts with them, and this is how they treat their customers!! please help! This is really ridiculous now.