My sister provided Hyundai Motor Finance my phone # while hers was not working. I received a call from their XXXX number and when advised my sister was not available and asked who was calling. Female declined to identify herself or her company. I advised that the cell phone being called belongs to me and they no longer have my permission to dial my number manually or via their automated dialer. Female then hung up on me. My sister took care of the past due payment ( was just an oversight ) and we assumed everything was good. payment rec by HMF on XXXX/XXXX/15. On XXXX/XXXX/15 I recevied another call from HMF. I had my sister call back and they advised her account current and no record of call. Advised could furnish proof of call and requested again that they no longer call me.Rep said nothing he can do. Sister requested supervisor who told her the only way they would guarantee no calls to my phone is if she revokes her permission for ANY phone contact. My sister said she still wants to be contacted, just not at my phone number. Supervisor said nothing he can do. Also said that there were no automated calls out and that the only way she would have been dialed after she revoked permission, would be a manual dial. I called back in and advised that it is my cell and I revoke authorization, that they absolutely were not to manually/auto call my number any further. Ultimately they were calling out to an unauthorized party about a current account ... manually. Intentional harrassment. I received another call today from the XXXX number and a 28 second long dead air voicemail. Sister called back in and of course they had no record of call and were unhelpful again. I called back in, they said i had to get in touch with consumer affair department and because I 'm not a customer, just an innocent third party that they are harrassing that I would have to communicate with them via mail. Finally agreed to send me over via phone so solution could be expedited, but they kept just transferring me back to customer service. Eventually male rep told me that there was nothing I could do about the phone calls.