Contract extended without consent at inflated billing.

This complaint relates to Account Number B ********** -2. We had a contract for data (24 mths) billed at R 301.66 after reduced charges were app****. This ended in September 2018. Vodacom unilaterally continues with contract at R 503.38 pm and reflects the item as a 24 mth contract. We never agreed to this , we had calls from various persons purporting to be from Vodacom offering a 2 year deal at a R 20 pm reduction which we rejected out of hand. Contract cancelled on 3.11 2018 by email . Please confirm cancellation process is happening.