Trick to get their phone number when spoofed?

Hi!
Just got a tech support scam call.
I told them that my phone battery was low and that I need a number to call them back just in case. The number was clearly spoofed as they told me they were from Ontario and the number was from my neighborhood…
They told me to charge my phone battery and they’ll recall me in 30min…I tried to get a phone number without success.
Do you know if they is a way/trick to get this phone number? Thanks

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