แจ้งปัญหาและร้องเรียนอย่างสุภาพ

I'm afraid there's a problem with...

I'm afraid there's a problem with my order.

This isn't quite right

This isn't quite right, could you check again?

Could this be fixed?

Could this be fixed as soon as possible?

I'd appreciate a refund

I'd appreciate a refund for this item.