I think there's been a miscommunication.

Meaning

We haven't understood each other correctly.

Examples

• John: 'I never received your email.'
• Alice: '<b>I think there's been a miscommunication</b>; I'll resend it.'
• John: '<b>I think there's been a miscommunication</b>. Let's review the data together.'
• Alice: 'The report shows different figures than what we discussed.'