Vodacom damages my phone and I must pay

I took a contract upgrade out with vodacom the glen 10 months ago for an LG G4. 4 weeks ago I took my phone in as the last software upgrade I downloaded caused my phone to constantly just stitch on and off. I was advised the phone is still under warranty and they would send to head office for repairs which would take three weeks. 2 weeks later I got a call from head office that my camera on the phone is cracked and that is not covered by the warranty. I advised them that when I took the phone in there was no problem with the camera and only issue was the phone switching on and off. I was advised they would look into it and get back to me. It's 2 weeks later and I got a call today to say they sending the phone back to The Glen with nothing being done on it as I am not willing to accept the cost of repairs for the cracked camera. Why should I have to pay for Vodacom's neglect???? When booking my phone in, it was noted that there was no damages on the phone so why is the camera now cracked ???? Vodacom needs to take responsibility. Myself and my wife have had contracts with Vodacom for the last 10 years and their service seems to get worse and worse as the years go. SAD !!!