***** on account, no response after 3 weeks

My data account was upgraded WITHOUT my concent, and I contacted Vodacom. They stated I need to go to the Police station, and give an avodavit that I didn't not authorise this (as I did), and then forwarded it to the Call Centre who forwarded it to the ***** dept. I JUST received my SECOND more than 3 times the normal amount invoice and I don't know what to do anymore.