No seed backup this is impossible to recover since you don't have access to the email and number.
Recovering using that information still needs a seed backup, so it is impossible to recover unless you have the seed backup.
If he contact the customer care, they can not help him. The phone number and email belong to his ex and not him. If he contact the customer care, he has no prove that the account belongs to him.
Contacting the support takes months before you get a response. Blockchain is known to have the worst support. You will get the response after 3 months or so based on what I heard from other users' experiences.