Vodacom Fibre Billing

Please could someone call me regarding my Vodacom contract agreement. I agreed to a 60Up 60Down line at R699.00 - when I relocated I was downgraded on speed to 50Up and 50Down - but my billing has increased. At no point was this discussed with me - the person paying the bill and I would like to know what the process is for cancellation with "reasonable cancellation fees" as per Tribunal ruling. The service received from Vodacom has been one issue after the other - and trying to debit as they will is not ok.