Bill increase when told it won't increase

Dear Customer, Thank you for the time and effort taken to voice your dissatisfaction to our office. It is with the cooperation and feedback from valued clients such as yourself that we are able to identify any areas of improvement within our organisation. Our records indicate that your query was escalated to the relevant department and based on the feedback received, the feedback provided is as follows: The investigation has been completed and has been deemed invalid (not in customers favor). Please see below investigation findings: Query Deemed Invalid as the customer was informed that the subscription will be R415 per month and will be excluding device instalment VAS or any discounts. Failed attempts to contact you however a SMS has been sent to you. Regards,Vodacom Consumer Website Team