Planetspark — Payments getting deducted despite cancellation of classes

Website:

www.planetspark.in

I had enrolled my 2 kids for English classes.
Monthly fee was getting auto deducted from my account.
I stopped the classes more than 6 weeks ago, and informed them that I want to cancel the sessions. They said ok and informed that payment will not be deducted.. but every month the amount is getting auto deducted and if I don't keep sufficient balance, they bombard us with calls, emails and messages..
Repeated efforts to contact the executives concerned have failed..