Vodacom cancellation

I was having a contract of two years with Vodacom from 2019 up to 2021 November paying R299 a month i went to Alberton and Germiston Vodacom branches last December 2021 to cancel the contract they told me i must call Vodacom customer service i did that when i called Vodacom customer service they told me that my contract have been canceled i even asked them to send me a cancelation letter up to now i didn't recieve a cancellation letter as they promised that they will send via my email but I keep receiving statements that am owing they keep on deducting every month and am always reversing what they deducte. "Vodacom Acc no Computer Generated StatementAccount number: I***-1Statement Date: 03/04/2022I***-1Christopher Mbandana12934 phola parktokozaalberton1426Account summary:Date Description Item number Reference Amount Total04/03/2022 BALANCE FWD 969.88 969.8801/04/2022 Invoice H4-YB7VQ Combined 190.00 1,159.88Total due 1,159.88Vodacom (Pty) Ltd. Registered office. P O Box 3306 Cramerview 2060. Company Registration No. ***. V.A.T Registration No. ***Page 1 of 1"