A TESCO buyer criticized a "paternalistic" online customer assistant who corrected her complaint – in Latin.
Siobhan Neiles was disgusted to find out what she thought was a mosquito at her lunch and complained online.
The 33-year-old man was shocked when a member of the customer service team identified himself as "a little entomologist" and missed the point of his complaint.
The smart clogs resorted to Latin, adding that the mosquito was indeed a fly "of the Simuliidae family."
Siobhan, of Ashford, Kent, bought the pan of tomato and basil from his local shop and began to eat when he discovered the insect.
She posted: "When you're working on what you think is a healthy lunch to find a huge dirty mosquito in your veg pan.
"Thank you Tesco – now I feel sick. I hope you wash and check their quality next time. I played the other two I bought in the trash.
She was surprised to see a response from a customer service representative who claimed to be "a little entomologist."
He wrote: "You will be pleased to know that the insect is certainly not a mosquito and appears to be a fly in the Simuliidae family.
"This does not make the discovery any more enjoyable, but I hope her fears associated with it possibly being a mosquito have been suppressed."
He added: "Our great British climate makes it almost impossible for mosquitoes to survive here."
Ms Neiles said, "To be honest, I would have left the whole thing if they had sent me an apology in their response and a refund of the money I spent.
"I also did not receive and I received the condescending response back."
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She added, "It's almost like he's making a joke about it. And he's not even right: there are more than 30 species [of mosquito] in the United Kingdom."
A Tesco spokesman said: "While our customer service colleague is trying to help in his own way, we appreciate that this does not meet our usual high standards and we apologize to Siobhan for his experience.
"We are in contact with Siobhan, so we conduct an investigation into the product, as well as provide a refund and a gesture of goodwill."