Promo Plan Change $15-$30. No notice.

Okay, so I was on the $15 promo plan, and went over it and there was no expiration or duration. One could think if it’s changed or not on auto renew it could be changed/removed. Either price, data etc. 

So I was surprised to login, and discover the price has doubled without even knowing. 

My Question is.. Why?! 
Why, 

- No Notice 

- No Reason

- No Details

- Changed because?

I have has enough issues when trying to get a new phone and all of the lies, difference in price, restocking fee, plan change when I contacted Customer Service and there was no satisfactory resolution, or an apology.

Now, this. 

Thanks.