Pathetic service and unauthorized billing by Vodacom Cellucity Pavilion

Vodacom increased my monthly premium without any prior notice or acknowledgement from me. Upon querying this, I was told that a sma was sent to the number which the Sim card is in my wifi router, even though my contact number was given to Vodacom Cellucity Pavillion upon application. I then queried the reason I was not getting any wifi signal at my new residence, a technician called me after an inquiry was logged by Bashir at Cellucity. Both the technician and Bashir promised me that my contract will be canceled and I will not be debited again as the network coverage is the issue with Vodacom, it has got nothing to do with me or my contract. Today, I got debited for R556 for a contract that is unable to be used and should have been canceled. I requested a manager call back, which did not happen, I requested a refund for all the extra debit amounts that have been taken, still nothing. The service absolutely pathetic.