Bad experience

Im so disappointed with rain because 2 weeks ago i spoke to a Support assistant and she said she fix it so i will pay on 1 November R559 but 2 days ago on the 1 November they billed me for a R1193 i dont understand so i call them and i spoke to support assistant again that same night so they said they will fix it so that i can pay R559 so yesterday i was waiting for that new bill to come and they said still the same on the website that i need to pay i dont use the simcard... So i try to call them again today and they said they have technical issues so that can see whats going on om my account.... WHY ARE RAIN LYING TO US ABOUT THE ADVERTISING THEY POST ON THE ADVERTISING SAID Unlimited wifi +2 FREE!!!!! SIM CARDS FOR R559 month by month if we need to pay more then that amount PLEASE EXPLAIN TO US I NEED TO SPEAK TO SOMEONE THAT WILL HELP ME CORRECTLY