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Or:
awk -F: 'BEGIN{
printf("Enter the email and username :")
getline ans < "-"
split(ans,a," ")
}
!(a[1]==$1 && a[2]==$2)
' username.txt

Hi,
Try this,

#!/bin/sh

echo -n "Enter email:-"
read a
echo -n "Enter name:-"
read b

c="$a:$b"

grep -v "$c" username.txt