I think there's been a miscommunication.

Meaning

I believe a misunderstanding has occurred.

Examples

• John: 'I never agreed to those terms.'<br>
• Alice: 'I think there's been a miscommunication; let's review the email exchange.'
• John: 'I think there's been a miscommunication. Perhaps we used different data sets.'
• Alice: 'The report's figures are incorrect.'<br>