No specific criteria for a Vodacom Contract

I have been trying to apply for a Vodacom Contract. I messaged a Vodacom consultant, told them I am earning R20K a month, have opened an account and I have checked on ClearScore that my credit score is now 638/705. I then asked what more I need to do to qualify for a Phone Contract. She just said that I need to build a strong credit store. It would be amazing if Vodacom could be specific with what a "strong credit score is" and what are their actual criteria for a Phone Contract.