Shree Tirupati Courier Service — my customers parcel returned without calling me or my customer stating address not found

Hi
My name is kanika i m a seller.
I have booked 1 handbag for my customer docket no[protected].
It had reached bangalore on 14th but without informing it u guys returned the courier to chandigarh stating address not found.
How can u return the parcel without calling the sender or the receiver about the address.
Now the courier person ([protected]) is saying its going back to delhi why???
Its pathetic i will not pay the shipping charges bcz of your courier guys stupidity.
I will do a police complaint if the parcel did not reach back on time.
As my customer is very irate and want a refund.