unhappy vodacom customer

I took out a contract in 2017 for a uchoose flexi 150, I signed my contract for R 349.00 pm, but I never paid this from the first installment that went off my account was R 358.50 when VAT increased it went up to R 361.58 now vodacom tells me they have a yearly increase of 10% on my contract and upgraded me to uchoose flexi 160 which I now have to pay for even though I never ask for the upgrade.

How is this even fair to say that its not an upgrade its a yearly increase and I can not say I do not want it.

If i want to down grade my account I must pay a penalty fee of R 325 because I made a commitment when I signed my initial contract?

When asked for a copy of my contract I was only sent the fist page of the contract where it clearly states that I only signed for the R 349.00