Sometimes we need to complain.
But how can we do this politely
First, we can begin 'would like to'
'Hi i would like to speak to the manager.
We can say 'I am unhappy about'
'Yes, I am unhappy about my late delivery.'
We can also add 'very' or 'really'
'Yeah, I'm really unhappy about this.'
We can also say 'it's unacceptable that'
'Yeah, it's unacceptable that my delivery is late.'
Remember, don't lose your temper.
This means 'don't become too angry' -
it's rude to lose your temper.