I think that you can try to use LEO Privacy to block unwanted calls, and at the same time, you can unblock them in this app. This is the best app to use to block and unblock unwanted calls.
LEO Privacy Applock Hide Safe Android Apps on Google Play
Usually to permanently unblock the number, you need to contact your phone service provider and ask them to unblock your number. You can then block it per call if wanted by dialing *67 before dialing the number.
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