This isn't the first time Tesco Mobile has slammed someone on Cat 3 | Adult Movies OnlineTwitter, and it almost certainly won't be the last.

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On Sunday, this person made the bad mistake of making a joke at Tesco Mobile's expense.

They didn't actually tag Tesco Mobile in their tweet, but it didn't matter. The damage had been done.

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20 minutes later, they hit back with the following response:

Tesco Mobile, of course, are no strangers to shutting people down on Twitter (for more examples of their sick burns, see here and here).

People should really just learn not to take them on.

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