DTDC — Very bad behavior DTDC Courier office representative

I am fed up with this dtdc courier. This courier sent my products back to the supplier without contacting me to collect these from office. So that i called the courier service and asked about the incident. Then they replied very harshly and harrassed me. They didn't even check the reason why its not delivered to me and they said there is no responsibility in this. Atleast they the haven't called me to deliver the product and products gone back. I was waiting for the product for the last 2 months. I contacted with ernakulam north railway station branch of DTDC and they harrassed me and spoke harshly from the phone number [protected].