Lotus Electronics — missing part of newly bought home theatre system

Address:

Raipur, Chhattisgarh

Sir today at around 8:00pm we bought newly purchased sony DAV TZ145 home theatre system and when we unboxed it we found one of the components missing that was HDMI CABLE AS PRESCIBED in the manual
Also the service person and the store keeper didn't check the item before delivery and dropped at home and gone away without proper installation and checking and abused us saying that if we didn't give them extra money they Will not cooperate or help in installation of products or checking of products
I want you all to take our complaints seriously
Kindly help us in this regard