Bad contract ever

My cellphone contract ended on the beginning of October but on November i was billed for the same contract when i contact them I'm told that since i didn't call and request for the cancellation then it means my contract is still active. I then requested for the cancellation, after two weeks when i called to check the status of my cancellatin im told that they only see the request but not yet cancelled meaning im still gonna be charged even in november. If i was charged for data and minuted i would understand because i would find the in my sim but still charging me for a finished cellphone contract is madness....and no one ever explained this nonsense of cancellation period before😞😞😞Never ever again.