terrible assistance

I called vodacom for assistance on a phone that I have purchased at a secondhand store the people at cellc told me that vodacom will be able to assist me because it's a vodacom phone wich is understandable so I tried to use any other sim in the phone but it would not work so I know it's network locked I called vodacom and asked is there anyway to unlock the vodacom phone to any network the lady told me she will have to ask her superior after waiting 3-4 min she told me to select the network via settings I told her it's not settings it's locked to vodacom network she went to go talk to her superior again and returned and told me vodacom can not lock a phone to there network and that the fault was on cellc's side I told her it isn't it is the vodacom phone that is network locked and asked if there is anyway to open to all networks she kept on saying it's not vodacom it's cellc so I left it at that I called cellc and one again I was told it is network locked so I told them vodacom doesnt want to assist me cellc can't help cause it's not there network but vodacom that doesn't allow it cellc ruferd me to a samsung store and said that would be able to assist me,no thanx to vodacom. ...