If customer will refuse to collect the shipment OR not paying the COD amount then logistic company will return it back to you. But, you will have to pay for return shipment also.
Delivery Charges = Rs. 25 + Rs. 12 + Rs. 5 = Rs. 42
COD Cash collection charges:- 50+15.5% (Service Tax) = Rs. 57(approx..)
Total Shipment Charges:- Rs. 99(for one side)
Charges on returned package:- Rs. 42
So, Total you would have to pay is :- Rs. 99+ Rs. 42