Airtel — automatic services- can't cancel

Address:	New Delhi, Delhi, 110075
Website:	www.airtel.in

Hello,

Today I was charged (for the second time in a while) for the AIRTEL GAMESWORLD service. Neither did I opt for such service nor was I notified before being charged for it. The given number, to stop the service, "isn't available at the moment" and when I text them they show it as an active service but I can't cancel it. Whenever i put 1 (the code for it in active service) it simply shows invalid. Can't call, cancel service. Even the activate/deactivate service section on my 'My Airtel' app shows "Please try again later."
This is no way to take money from customers. Activating services without their consent, charging them and not allowing them to cancel. I want my refund as well as this service to stop immediately.