Code:
=> awk -F',' -v file1="$1" -v file2="$2" 'NR == FNR {a[$1,$2,$3,$4]++;next} !(a[$1,$2,$3,$4]) {print FNR FS $0}' OFS="," 1.txt 2.txt
1,7000,john,2,0,0,1,6
2,7000,john,2,0,0,1,7
3,7000,john,2,0,0,1,8
4,7000,john,2,0,0,1,9
5,7001,elen,2,0,0,1,7
6,7002,sami,2,0,0,1,6
7,7003,mike,1,0,0,2,1
8,7003,mike,1,0,0,2,2
9,7003,mike,1,0,0,2,3
10,7003,mike,1,0,0,2,4
11,8001,nike,1,2,4,1,8
12,8002,paul,2,0,0,2,7