Vodacom Daily Spam Calls After Multiple requests to stop!

They deleted my email accounts twice. I have lost important information including my dad's estate documentation. They never even bothered to assist the second time - no response....NOW they spam call me EVERYDAY from *** asking to speak to someone else. I have politely told them to make a note on the system and not to call but they call again - sometimes up to 10 times a day. Sometimes I answer and then it just drops. I am going to file for harassment if something doesn't change. The interruptions and waste of my time is beyond bearable now.