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Please see this thread, it may help with your Cupid code: https://forum.vodafone.co.uk/t5/Other-broadband-queries/Struggling-with-landline-number-port-out-of-...
So the CUPID ID for a standard Vodafone telephone number is 007 which the company you are switching to should be able to verify in about 2 seconds flat! I would seriously be concerned if I were switching to a telco that is that incompetent that it couldn't find that out itself!
If it's not originally a Vodafone number (say originally a BT port) your new telco should be able to query the number and get that info in seconds.
*I wouldn't actually expect the customer services of most telcos to know that info, they'd probably think you were talking about a Kenney Everett character!