Charged for services not provided

Worst services ever. This company is making me pay for services they failed to provide. My network line was down from the 28th August, I have paid for September to which I did not receive any service and requested a refund which is pending. They then charged me for October and advised me that is wont be refunded because of the 30 days notice, but the whole reason to this cancellation was because they failed to provide the service. Why should I has a customer pay for something they failed to provide.