Hashcat settings - explanation

[undeath]

hashcat -m 2500 -a 6 something.hccapx wordlist.txt ?d?d?s

Except for the mask ?d?d?s this is the correct command for what you wanted to do. ?d is a placeholder for digits and does not include (uppercase) letters and you are missing the placeholder for the number at position three (?d).

hashcat -m 2500 -a 6 something.hccapx wordlist.txt ?u?u?d?s

This command will find ttaabbccBI1* if ttaabbcc is in your wordlist.