I have an issue with amazon free tier account, I have deployed two EC2 instances (1 linux and 1 windows) on amazon each having 30GB of storage which is permissible under free tier, these instances are continuously running 24/7 so that they are always available,what I don't understand is that starting last month I have had charges to my account for exceeding cloud storage usage that have left me confused.
I have read details on Free Tier more than 5 times but I still can't understand what I'm doing wrong, checked the Cost Explorer, the only thing that comes to mind is perhaps the 30GB is applied universally for all instances but I am not sure as I don't know how my account usage is calculated. I have tried contacting support assistant but I am yet to receive any response from them.
I would really appreciate if someone helped set some things straight because I have hit a wall with this one.