My phone which I bought cash now Vodacom claims I've stole it...

On the 1st Mar 18 around 16:49 I received a call from unknown number. The lady identified her by the of Ms Makgajwane from Vodacom forensics and incorrectly identified my name and my handset. She informed me that the phone m using was reported swollen. She asked me to tell her where I bought the phone, but I didn't provide her with the information required because I felt like I've been ****med since she failed to correctly identify my particulars. Firsly she said m using a Samsung S 7edge gold instead of Black and secondly she said im Lawrence instead of Desmond. After failing to provide her with the information she threatened to blacklist my phone. Since I was under an impression that I've been ****med I asked her to make an appointment in order to enable me to identify her. She refused. I then dropped the phone. On the 02 Mar 18 my phone was blacklisted. I quickly went to the Vodacom outlet where I bought the phone to investigate why is my phone blacklisted due to ******, the agent by the name of Sunil called Vodacom and was given forms to complete which I did and was promised that the matter will be sorted in 24 hours but still to date my phone which I bought last year cash is still blacklisted. I tried to call the Vodacom forensics and requested to talk to the aforementioned lady but this time it was worse she gave me attitude and dropped my call. Pls help me how to resolve this matter. I'm still in deep frustration.

Regards Desmond Mukhawana ********** ********** 764888 alt ********** office hours