Reliance Digital — issue in delivery and installation

Have never experienced such a pathetic client service in my whole life..have purchased 7 products from Reliance Degital Infinity store Malad, Mumbai in August and was promised that all the products will be delivered and installed by 15th Oct...since then have been running around and calling store manager/Sales person every day as the work at my house got stuck because of this, but not getting any response from them...in fact they have stopped answering my calls. Have put a complaint in customer care desk as well but they also do not have any clue as to what needs to be done as warehouse is unable to locate my product. Don’t know whom to reach out to who can take immediate action and arrange installations of the products quickly.