Why should you continue billing a burnt decoder after asking you to terminate

On 27 September my explora 2A was stuck by lightning and next day i had to ask multichoice for advice upon which they said i should take it to a service centre. News at service centre was my explora is fried annd unfortunately i had no money to replace it. Since i was on xtra view i deciced to cancel xtra view and activate the small decoder ( model 4U), and asked dstv to cancel the explora subscription as it was dead. Now i am checking my statement and they never cancelled the eplora subs. I have been paying for something i am not watching because they say system can only be scheduuled once a month. Surely there is someone who can override esp if there is a faulty decoder. Dstv should do something about this coz its a clear ******* and unfair practice they should be arrested. Even their system realised a faulty decoder as seen on statement but not when they want to ***** the money.