Overcharged and no response ref ***0

Good day<br> <br> I am currently on a R49 month to month contract but am been charged R80 a month, when i contacted telkom mobile was told about added services that are now been charged so i canceled the services and received a sms notification of the cancellation yet i am still been billed for the services, I have contacted the call center on few occasions and been told the person handling the case will contact me and pass the credit, Its almost 3 WEEKS now and no responses. I wounder if the person responsible cannot do the task allocated to him or its Telkoms way of over billing me again in the new month. Its also surprising that when i was on the contract all the services were added at no charge but now im been billed for every small service.