We got you here in the Community, @rob21.
Restoring deleted customers may be quiet tricky in QuickBooks Online (QBO), because once you deleted or marked the customers as inactive, it can't be seen easily in the account.
By going to Customer menu, there's an option on the Gear icon that will show you how to restore deleted customers.
The photos below will serve as your guide.
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Hi there, Roydent.
The steps provided by my colleague above makes your inactive (deleted) customers active again so you can see them. If you followed the steps and they aren't showing up still, my suggestion to you would be to reach out to our support team. This is because they have unique tools such as screen sharing capabilities. Those tools give them everything they need to jump into your account and diagnose whatever your issues are. To reach the support team follow these steps below.
To ensure we address your concern on time, check out our support hours.
If there's anything else I can help with in the meantime, feel free to reach out below. Thanks for dropping by and have a lovely weekend.