Instant recharge

Two months ago i logged a dispute on my account as i was being charged instant charges on my account, i have called the call centre countless time and I'm still not receiving any help, i told them to cancel the service on my account and to my surprise the charges have occurred again.. No one is able to explain why my account is being charged... This is now occurring for the second time and my has already being billing for a service that i haven't used.