I phoned my service provider, because i need to find out my PUK code, but it didnt recognize my mobile number?

i need to find out my PUK code, so i phoned vodafone customer services and the automatic machine voice told me to enter my mobile number, so i did, and then it told me that it didnt recognize it, i have tried it several times - and i am sure that is my mobile number - anyone help me out here?
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