Vodacom Stop bullying your clients

I have had a contract with Vodacom for 2 years. When my contract was due an uprade I emailed to cancel as I no longer needed their service. They are now sending me final demand letters saying that I owe money since November 2019. I have called numerous times and been asked to send proof of my correspondence with them. I have done this and yet I still get these threatening letters. Vodacom stop bullying your clients. I CANCELLED MY CONTRACT IN NOVEMBER AND I NO LONGER NEED YOUR SERVICE. END OF STORY.