As per D2H CC....
1+1 HD offer means 1st month costs Rs.175 & 2nd month will be free...
From 3rd month onwards Rs.175/month
2+2 HD offer means 1st, 2nd month costs Rs.175 & 3rd, 4th month will be free...
From 5th month onwards Rs.175/month
Like that....
CC guys have no idea about below Add-on's