Poor service no customer care eticette

Vodacom 4 I in Trade Route mall has the poorest of services that I came across with the manager and all. I send a new S22 back because it heated up than they sent it for repairs. Then I phoned them to ask to change phone and they said I could not. I then requested to cancel the upgrade only to struggle now over two I was told to wait for the phone to return from repairs before I can cancel. I only have 14 days to cancel and it seems they purposely make wait and the 14 days is done already. Very frastruted poor, poor service