Altos Advisory Services — Not getting the refund and no responses for cancellation of services

One day I received a call from Elite Advisory Services agent Named Arpit and asked to me take 2 days demo of their trading and learning services. first 2 days he gave the calls for trading and on second he call continuously calling me to purchase the service for 6 months worth Rs 25000+ first 2 days demo cost. After so many calls he convinced me to purchase the membership worth 29900 including demo session cost and GST.
Since then, i was not getting proper calls from him (disappeared for multiple days). so I sent them the mail to cancel my membership.soon after that suddenly another lady called me named Prachi and convinced to give better service but from her also i was not getting any regular calls rather she was asking me to take risky trades which i refused. hence, i sent them the reminder to cancel my subscription but suddently Aprit calls me starts to talking in bad language. NOw I am trying to reach them via calls n mails n their website complaints options but there is no response from them. Please help me get my refund back.