A simple repair gone sour

I went to the vodacare to book in a phone that was not charging. I was told it it probably the charging port and should be repaired under warranty. Later that day I got an SMS saying it was being taken to an advanced repair centre but was not informed on the warranty status. I phoned the branch and was told that because the phone had a hairline crack on the back glass of the phone the warranty was now void. Having spoken to the manufacturer repair centre earlier thay day I was told that it would not void the warranty. When I asked to speak to the manager I was told thag he wasn't available and they would get him to phone me. The next day still no phonecall. When I phoned to speak to Leonard, the manager, to tell him I want to cancel the repair I was told \tough