LONDON -- If there's one thing you should never, ever do on Twitter, it's criticise Tesco Mobile.

Even if you don't mention them directly in your tweet, they'll see it. And they'll come for you.

SEE ALSO: The 5 Most Notorious Brand Feuds on Twitter

This was a lesson Joe Lee learned the hard way on Sunday, after he made the tragic mistake of throwing some shade at Tesco Mobile with the following subtweet.

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Tesco Mobile didn't pull any punches with their response.

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Ouch.

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This man summed the whole thing up pretty well.

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Others, meanwhile, immediately thought about changing network purely on the strength of Tesco Mobile's comeback.

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Of course, this wouldn't be the first time Tesco Mobile has shut someone down on Twitter. They've got form.

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Just don't mess with them, OK?

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