I brought a subscription but when I try & add a new customer it says there is a prob with my subscription. I’ve tried restarting my iPhone, removing & replacing the app

Thank you for using QuickBooks as your business tool, @jadeparsonagewor. I appreciate all the troubleshooting steps you've done to get rid of the subscription problem. It's convenient indeed to add a new customer via the app. 

Since an issue with a subscription involves personal information, I recommend contacting our Support Team. They can investigate and confirm if the payment successfully went through. Rest assured that they will do the process securely.

Here's how to reach them from the app:

1. From the Menu (☰), tap the question mark icon at the upper-right corner of the page.
2. Click on the Help & Support under the Help & Feedback page.
3. Tap on Contact us under Help & Support.
4. Type -in a short description of your concern under the What can we help you with? window, then click on Let's talk.
5. Choose a way to connect with support.

Otherwise, follow the steps below to get in touch with us via browser:

1. Go to the Help icon and choose Search.
2. Click the Contact Us button and enter your concern.
3. Press Continue.

See this article for the operating hours: QuickBooks Online Support. It specifies the time for chat and call support.

For other features you can use in the program, visit this link: Help Articles in QuickBooks Online. From there, you can browse the subtopics that will guide you in accomplishing tasks.

Don’t hold back by dropping a comment below if you have any other questions or concerns with your subscription. I’ll be here to help you. Take care always.