Netstar companion *****

A lady called me I think two weeks ago regarding Netstar discounts staff I told her I am not interested boom on the 2nd of May R138 is deducted from my account, I called Netstar on Saturday the 3rd of May I was told finance department will be available on Monday the 5th of May, I called this morning to enquire about money debited on my account, and was told it’s Netstar companion fee which I never sign up for, now I want to cancel this debit order I am not getting help because they said their line is busy, please help me cancel this debit order