I can't get in my apple ID because I don't have the old number

See if anything here helps.  If necessary, you can use account recovery as explained in the link at bottom of the article.

Verification code - how to get one and sign in with two-factor authentication.   

jadieldtorres Said:

"I can't get in my apple ID because I don't have the old number: How can I update the verification number to access my icloud"

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Contact Apple Phone Support:

While on the phone with the Apple Rep, try logging in with the correct phone number getting the correct code. Once all seems set, then it would seem fine to end the call. Apple will see this from their side of the call, and will run you through the fix.

Apple Phone Support Info:

• Contact Us - Choose Locations
• U.S. (800)MY-APPLE
• Proceed from there as Necessary

Why the Wait:

Phone calls are taking a bit to go through at the moment, due do lots of calls. With the Coronavirus Pandemic, many are at home at the moment, with much time on their hands to contact Apple. So, just stay on the line, and you will get through :)