Frustrated with this brand

I have 2 issues today and no one can help me understand or resolve.

1. I took out an online contract 2 days ago and the sim was delivered within 1 day later. great. I was told it takes 24 hours for activation yet it took, 8 hours, great. After using the sim for 1 night, the next day it was completely dead. Couldnt use it, tried to call department after department and no one can assist. I was then told they are sending me a new sim. After 1 day, the sim is damaged?

2. I cancelled my contract in May, in June i got confirmation it is now prepaid, the i get slapped with a bill 60% more than usual and am told i dont get discounts. So how does this work, you stay on contract you pay less, you cancel and pay more?

All I have been asking this entire day, Reverse the charges and do not debit me. Sort out my sim issue, so i dont have to hassle. Why do i have to write a negative review to get good service.