Contract account mismanagement

I don't even have a word to explain how pained I feel after finding out that you have increased my mother's Fibre account by 25% from the contract that she initially took. She took contract for R399 and now it's R499. Wow! We are loyal customers of Telkom, we have taken several contracts with Telkom since the 90's and we received both good and bad services, but to to this multitude. We have never had our contracts increases without an upgrade or downgrading. So if this is how it operates, what's going to happen in 2 or 3 yrs time? An increase to R699 or more? No this is not right, she took a R399 contract because that's what suit her pocket. Hello Peter, please help...