Pathetic service

Been going back and forth with intellicell just for my account to br closed and I asked for my debit order to be cancelled cause I'm done paying them, but still they are debating my account for what , the refunded me last month my 2months money debited but still yet again I'm debited this morning and now I'm asking proof confirmation that my debit is cancelled by them and they can't send me that instead they can send a paid up letter after 40days for something that is not my fault what do I do cause I really can't wait that long for my paidup letter and comformation that debit is cancelled.