Netstar is stinking pathetic!

I called and cancelled my contract the same month my contract ended, I even received an email that contract is cancelled but after 17 months of cancellation, they debit my account R930 and my monthly debit was not even r300. Netstar is **********ly debiting my account and I'm unemployed and there's unnecessary charges due to insufficient funds. All they chasing is poor people's money but they render **** service, with their app that's always supp**** incorrect information about where my car actually was! Nobody had the decency to call and tell me about their plan to debit my empty account. They're so pathetic! It's frustrating having to pay charges unnecessarily cost by them.