VODAMAIL SERIOUS SECURITY BREACH! ACCOUNT HACKED AND VODACOM WILL ONLY RESPOND IN 48-72 HOURS???

I am a Vodacom customer for all my life 40+ years. Without exception my queries over all these years literally takes weeks to get solved. Last night I received an email (from my OWN email address!?), addressed to myself, with extremely serious threats to my personal accounts as well as my devices, and also demanding money stating I should not dare go to the police with this matter! I immediately called Vodacom Customer Care, as this is a serious security breach and I had a long conversation with them, after which I was just told that somebody 'from their back office' is suppose to assist me and they only work during office hours. They logged the query and send me an sms with a Ref#, and told me somebody will call me this morning. Needless to say I am still waiting for the call! So I went to my local Vodacom outlet/store and explained the whole situation again to them. The guy tried to delete the specific mail in question but was not successful so he logged another call. In the meantime I am still in this terrible situation with SERIOUS threats of demanding money and threatening to hack all my accounts!!! I once again called Vodacom Customer care when I got home and explained the seriousness of the situation to them once again and gave the reference number to the lady, after which she just said I'll have to wait 48 to 72 hours for somebody to get back to me???!!! In the meantime I'm still exposed and my Vodamail account has been hacked with extremely serious threats to all my personal information and devices and I cannot do anything??? But wait??? THIS IS TOTALLY UNACCEPTABLE?? In the meantime Vodacom is collecting my money every month for all these years and I am receiving this kind of appaulling service????