Telkom allows ******* to use your account

My ****** Telkom Mobile account was reported, five months after the number still active, and I always receive invoices to pay the ******* account. After many emails and phone conversations, it feels nobody at Telkom can stop the ***** from using my account. I don't understand how a company can allow this to happen; it seems Telkom's management tries to get the most out of their customers even though they ***** money from them because Telkom allows ******* to use their client's account and invoice their client.