HORRIBLE EXPERIENCE. BOOKING PHONE IN TO REPAIRS 4 TIMES IN THE LAST 3 MONTHS

So my phone is still under warranty. It started to give me connectivity problem last year December 2020 First I've log a call with Vodacom and they have monitor my phone for weeks. After monitor it and the problem still occur they have advise that i needed to do a sim swap. after doing a sim swap the problem still occurs. I did went on leave and after returning I've decided to bring the phone to Vodacom Menlyn. They did book it into repairs and say that they will have to send it away for more advance Technical support. After 5 days they did advise that the phone is ready for collection and that they have changed the motherboard. When collecting the phone it was working okay but every now and then the phone will stop working and the problem reoccur. I then took again the time and went to Menlyn Vodacom where they have booked the phone in once again and they needed to send the phone away for more advance technical support.

After 5-6 days the advise that the phone is fixed and ready for collection (bear in mind that the phone doesn't have any cracks or damage visible whatsoever) When collecting the hone the technician said that they have done something with a data reset or upgrade and all is in order. The very same day when taking my phone home the same problem occurs. It wont work and no calls can be made or can be received. It only works with WIFI I did call them once again and they said i must book it in again. After this they have send it once again to advance team in JHB. After a few days they did call and say that nothing is wrong. I was furious because I know its not working. So I went to collect the phone and now im taking videos every day to proof that the phone is still not working properley. I will book the phone back in this Saturday with evidence where i will show them black on white where i take out the sim put it into the Samsung and it wont work then removing the sim put it into another phone and then all will work.\

I will cancel my contract because im paying for a phone that is still under warranty but its not working.

I cant understand how they cant change or fix the phone. This is unacceptable to go to such extend to proof your self - that your phone is giving you problems. Where is the trust in customers and supplier if u need to proof that the phone is not working