I WANT MY MONEY BACK, VODACOM

I TOOK OUT 2 CONTRACTS FOR MY TWO SONS AND ASKED FOR NO OPTION FOR ANY OF THEM TO BUY ANYTHING ON THEIR OWN, AND GUESS WHAT, THE VERY OPPOSITE CONTINUES TO HAPPEN. I SIGNED CONTRACTS FOR UNDER R400 PM, BUT SINCE FEBRUARY 2021 I AM PAYING R1000+, WHY ARE YOU *****ING MY MONEY VODACOM????????????????????????? AND NOW I'M TOLD THAT I OWE R1700??????????????????? THE NEXT CALL I GET FROM VODACOM, BETTER BE TO TO TELL ME THAT THE CHARGES ARE REVERSED