Airtel Connection Saibaba Colony Coimbatore

worst service,,when i was purchase Airtel modam 4g,this office staff was told me that let me hv a phisycal verificaion after that let me do contact customer care and ask them to activate the modam sim card,but customer care excutive told me that can not ubdate my deatail,i was purchase more than 4 days,i was contact purchased airtel people but they can not pic the phone my data card no was changed customer care oficer told me,what i can do,?let me hv a lot mental agnoy and hv a huge expences,,Dont belive the airtel peopels calls and dont trust this office address people,,all are fraud