I was using the trial version for my company then I subscribed using the 50% discount. It lead me to create a new company and my original company says I am still on trial

Let me help you manage your QuickBooks account, @userabdelrahman-zein.

You'd want to choose which of the two accounts you'd like to continue using. This way, you'd avoid getting duplicate charges in the future. Once you've decided, you can follow the steps below to complete the process. 

1. Go to the Gear icon⚙.
2. Choose Account and Settings.
3. Select the Billing and subscription tab.
4. From the QuickBooks section, select Cancel subscription or Cancel online.
5. Pick Continue to cancel, then select Continue to cancel again (if applicable).
6. Follow the next steps.
7. Click Submit and cancel subscription.
8. Select Got it.

However, if you choose to cancel the trial account. You can follow the detailed steps in this article: Cancel your QuickBooks Online trial.

Also, you can browse this link to see what will happen to the account you want to cancel: What happens to my QuickBooks Online data after I cancel?

Leave a comment below if you have other questions or concerns. I'm always here to help.

@userabdelrahman-zein 

When you clicked the Buy button, it open a new blank QBO account. You have to login to your trial account, navigate to Billing and Subscription menu, and pay the regular rate to continue your works.

https://quickbooks.grsm.io/EU

https://quickbooks.grsm.io/North-America