Cancelled my contract 3 months ago and apparently I owe 3 months subscriptions

I stopped using Rain sim card for the past 3 months, from what I know they minute they dont get their monthly subscription they cut off the services exactly a day after the due date. I flashed away the sim card since i no longer use Rain and changed my banking details. last months i have been getting calls saying i owe 2 months subscription of R958 I think and i explained to the agent that i no longer use Rain and is been months and dont understand how can it be active while no one is using it. Then the agent said now is been blocked and will do investigations and get back to me. Today i decided to go to my Rain account, apparently I now owe R1158 with a current invoice of R200? What the hell? I cant even access my profile, navigate or do anything on my account of which according to me this has been terminated 3 months ago and i agree i owe 1 month subscription since the subscription is not an advance.