Failed to deactivate account

I called Netstar in June to inform them about my car trade. I spoke to 3 different representatives in 3 different occasions, each assured me that they are closing the account. Fast forward 5 months later they’ve handed me to Credit works or whatever the name is, harassing me every day saying I have an outstanding amount of about R500 with Netstar. How insane is that? I refuse to be responsible for your *********** representatives who failed to deactivate my account since June. Dig up your call claimed call records and get your story write. And please stop harassing me, it’s not cute.