Unsatisfactory service from Vodacom call centre

My data 24 month data contract came to an end and I contacted the call centre to cancel and the consultant advised that she is unable to log a request as the contract end date does not reflect and was going to log an incident the following month the contract amount increased. I tried to call several times where as soon as I mentioned the word cancel I was pushed from pillar to post with consultants advising I dailed the wrong number routed my call only to find I was referred back to the previous number. When I finally received telephone confirmation of cancelation my September debit jumped by R400 resulting in unpaid debit due to Insufficient funds. I was contacted to make payment arrangements and when asking for a statement to view what I am paying for once I was told they cannot hear me another time the person went quite for a few minutes while I am asking for a statement. I went in store and asked for a statement and was asked to call a number I was not allowed to view the screen to see my billing and the lady said she could only see an account for around R1200 not R1900 + as billed. I find these consultants are very ********* when you cancel a contract it appears that they extend the contract. I wish to cancel all contracts with Vodacom and will seek legal assistance.