Showmax subscription

I have recently signed up for Showmax and I was debited twice for my subscription dated 21/09/20. Went to their live chat to query the second debit and I was advised that there were two subscription using the same card number which I received a confirmation that it has been cancelled however, I wont be debited twice going forward. Woke up this morning with two debits despite confirmation that the other subscription has been terminated which was not even mine. Pathetic and unacceptable service altogether with Showmax. Isaac