Vodacom Bad Service

We purchased Honor cellphone from Kolonnade Vodacom under contract, so after sometime it then started acting up, switching off by itself, sometimes would just show blank screen and signal as well was the issue, you would also have switch it off then switch it back on just to get the better signal but sometimes it would state "no service" for hours, so we then decided to return it to Vodacom Menlyn as Kolonnade Vodacom advised that issues with repair should be escalated there, we did that, where they decided to give us the new phone, guess what , we also experience the same issues with new phone that we were given and we had to also return back to Vodacom Menlyn repair as well then mainboard was replaced , after sometime as well the same issues started so now we had to book it with Savanna Vodacom repair where it was sent to Vodacom repair in Gauteng but now they want charge us R5000 for that and it is still under warranty, using crack on the camera lense as the scape goat, that phone had same issue before the crack. I am really not happy with this service, this product is *******...now phone signal cannot be restored. Why could not they give us option to choose different product then