Reliance Trends — Sales person service

Dear sir,
Today in have visited reliance trends vision 9, opp axis bank, bus stand road, surendranagar gujarat 363001. I have purchased rs 5343/-.
The service person told us for discount above amount rs 3600/-
He provide the benefits to one customer with me as he purchased 3600 rs and give him discounts additional products free and take only rs 2500/-
My bill amounts was higher so i inquired the discount policy but couldnot find satisfactory answer.
I ask for the contact no of manager there but he denied and told me that he is manager here, his name was mr parth chavada as told by him. I also ask him for contact no but he denied and said that you should go mumbai as the owner is at mumbai.
I could not understand the sales policy of reliance trend which name is sufficient for customer to buy but giving authority to such persons who is not reliable for rate and discounts to give benefit to customer to customers.
I have called customer care no [protected] he asked me the store no (Four digit number below total amount as told by customer care person) but i am unable to find this no, then he ask me area pin code no i have provided him but cannot track by this and advise me to complaint on website.