That's entirely unacceptable, and I'm truly sorry.

Meaning

Expressing strong disapproval and sincere regret.

Examples

• John: 'The level of customer service was appalling.'<br>
• Alice: '<b>That's entirely unacceptable, and I'm truly sorry</b>. We will take immediate action to address this.'
• John: '<b>That's entirely unacceptable, and I'm truly sorry</b>. We will rectify this immediately.'
• Alice: 'The quality of the work is substandard.'<br>