i think VM are telling porkies or the agent is trying to get rid of the problem through lack of knowledge
if the phone came from VM then it is up to them to unlock it - apart from the phone shops i dont think anyone else can
so as painful as it is you need to go back to VM and try again - all help is offshore afaik - go through to the - thinking of leaving us people - they are usually more knowledgeable
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Tony