Vodacom 'Price increase"

in January 2018 I signed up for a R300 contract with Vodacom, which comes from my bank account monthly. Going through my statements I realized that Vodacom has increased my contract by R47.25 the first 6 months, then they started billing me R49 more 6 months after that and now my contract stands at 57.24 more than what I signed up for. To my knowledge is this even allowed or acceptable? I have had mobile contracts with other providers before and never EVER have I paid more than what I signed up for.. When contacting Vodacom, a consultant called me and sent me my first statement received from Vodacom, she then advised that she would handle the matter over to the billing department where all I received was an automated email stating their price increases.

I get that prices are increasing but if you sign up for a contract of R300 that’s what you expect to pay for the entire period, correct ?????????? I am utterly disgusted with this matter and I feel like other customers need to be aware of this, as we all have budgets and don’t want any surprises later down the line.

VODACOM , YOU HAVE DISAPPOINTED ME AND I WILL NEVER USE OR ADVISE ANYONE TO MAKE USE OF YOUR SERVICES EVER!!!!!