I'm sorry to hear about that.
You can report a technical problem through the Help center.
Also, please note that Instagram may restrict your account for the following reasons:
1. Following or unfollowing a lot of pictures (there is a limit of 500 per day).
2. Mass liking, commenting, and/or messaging.
3. Posting too much.
4. Sharing violated or harmful content.
5. Using a third-party app - make sure to uninstall any third-party app.
Normally, a blocked account recovers within 24-48 hours.