Vodacom repairs fourways has damaged my phone and now want to quote me for the problem they created

Bad Service from Vodacom repairs Fourways till Naomi have not been assisted in anyway. No one is taking my situation seriously at all. My phone was booked in for repairs in the month of July which was covered by my insurance witj vodacom and I collected the phone on the first Friday of August only to find that the phone was faulty as a result of the repairs. I could not sufficiently read the SIM in the phone but I thought it was an issue with vodacom network so I later returned the phone to vodacom to get it checked and they found that they had to replace the "motherboard " however they are making it my issue that my phone has a small crack on the back cover which does not bother me and does not concern them, the main issue is to repair the damage caused as a result of their poor job. I would like my phone in the same state as I left it when I booked it in for repairs. All this resulted from fixing a cracked screen.

I am being treated like a nobody. No one is attending to my matter.