Content Service unauthorised billed to Account

In November I raised a complaint to Vodacom regarding unauthorised charges of "Content Services" which were never requested. They said they were only able to reverse 3 month worth of these charges which they had added to my mothers account. I was told that the "Content Services" were now blocked. Today I see once again +- R121 content services added to her account. Do we really have to police our accounts in such a manner to ensure Vodacom does not charge us for items we never requested. This line is due for upgrade but I'm seriously considering taking all 8 of the business lines I have to another service provider. The line in question is once again ***