DTDC Courier & Cargo — Not delivering items and lying and misbehaving not refunding money

Address:	700091
Website:	www.dtdc.in

My sister couriered me 2 books through DTDC courier from kolkata saltlake sec 2 office on 30th march 2017. after paying 460 rupees she was told that it will delivered within 3 days in pune. when it was not delivered within time she went to dtdc office but they assured within 2 days it will be delivered. but it was not delivered. today she went there so their employees was totally ignoring her. told her that it was her mistake. nothing was wrong with the address and contact. then she talked to some higher authority what they told it was more shocking. they were completely lying some time they told the address was wrong. some time they told contact was wrong, sometime told that they delivered the product, or they called me but i didn't response. the address is commerzone IT park, yerwada, pune, Maharashtra 411006. I am not mentioning the company name it is top most it company in India.one of them told no such company exist. they also told why didn't he buy books from pune? instead of helping her they were mocking her and started making fun.and told they will not refund any single money. the package was not delivered to me or not returned to her, they were refusing to refund her money. and instead of helping they were embarrassed her and were lying continuously.
the CN No of the courier is K96112796 and i am attaching the bill as attachment.