Seagate — Hard disk replacement not received and not able to track on given courier details

Address:

Gautam Buddh Nagar, Uttar Pradesh, 201301

Dear sir/madam,

I have purchased seagate harddisk and after two month its stop working. Since it is in a warrinty so i have placed online return. I have sent my hard disk on chennai cso. And as per their record shown on seagate website they have shipped new hard disk on my mentioned address on 20 oct 2016.
But now its been one month i have not received it. Also the courier infotmation given on portal useless as i am not able to track.