Telkom charges what this want

I signed up with telkom fibre for R450 per month ,only not to pay the R450 but R498. When I querried the bill b I was just told the price went up.and that it will go up again next year. This is unfair practice as how can you advertise one thing do another. In addition to wanting me to pay a R1400 for an installation that should not have been charged for in the first place. Not happy