The Worst Customer Service

I called the call centre a month after joining rain network to cancel and the lady had such an attitude. When I asked to speak to somebody in management she told me that her supervisor is busy and would call me back. A month later still no call and money debited from my account I called again and asked for the supervisor and same story. 2 days later and still no call. By far the worst customer service! I wish there was a way to escalate my matter. I am running out of patience!