Vodafone — Porting issue with 1900yime

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Vodafone

I have received an SMS stating that I need to upgrade my sim to 4g or else it will expire day after tomorrow . So I visited the store to upgrade the sim card however Iam not the owner of the sim and hence I was informed that I can change the ownership by opting post paid option . I agreed as the number was important to me, however they need a code from 1900 number to port which I'm not receiving for some reason . I cannot visit the store on a daily basis for this small thing. Highly disappointed