God speed, OCI is a pile of garbage. Once had them delete every single one of our production servers in the middle of the work day (in the hundreds of instances) due to an uncaught billing error. Triage took over 3 three days and there was a significant amount of lost customer data and financial impact. I wouldn't recommend OCI if they were the last cloud provider on earth.
were their billing reminders going to your spam folder or something?