Telkom increasing pensioner landline tarriffs without notification or communication

Telkom has decided to increase tarriffs on my pensioner mothers landline without notification. I emailed a query just to be told that the tarriff has increased? This is ridiculous as this was not communicated upfront. Also as enquired the billing does not make complete sense as some items are being billed to a date in November but its the October bill. Please rectify this billing and provide a detailed explanation of the billing