When you supply a pattern with -t, you need to give crunch a minimum and a maximum length, each equal to the length of the pattern. To cover a range of lengths you need to run a sequence of crunch commands, each with its own pattern.
To get a combination of numbers and special characters, you need to give crunch a charset string. This can be done directly in the command line or from a file (with -f). The following commands use the former method:
crunch 8 8 '0123456789!@#$%^&*()-_+=~`[]{}|\:;"<>,.?/'\' -t Helen@@@crunch 9 9 '0123456789!@#$%^&*()-_+=~`[]{}|\:;"<>,.?/'\' -t Helen@@@@crunch 10 10 '0123456789!@#$%^&*()-_+=~`[]{}|\:;"<>,.?/'\' -t Helen@@@@@Together they will generate the wordlist you want.
Alternatively use crunch to generate the variable substrings only; pipe the result to sed to add the fixed prefix (Helen) to each line. The advantage is you don't need -t now and thus you can cover the whole range of lengths with one crunch:
crunch 3 5 '0123456789!@#$%^&*()-_+=~`[]{}|\:;"<>,.?/'\' | sed 's/^/Helen/'