A lorry driver was clamped after he pulled over to answer his mobile telephone in an industrial estate.
Dan Fitzpatrick said it happened in the three minutes it took to take the call in the no-parking area of Prologis Park in Coventry.
Mr Fitzpatrick, who works for Road Night Logistics, based in High Wycombe, had pulled over to write down the address of his next delivery.
Ian French, general manager of the firm, said: "He did the safe, sensible and right thing and we have ended up getting penalised for it. We were incensed by the fact that they were able to do it in such a short space of time."
Mr French said the clamp was put on during the telephone call, which lasted exactly two minutes and 56 seconds.
Trevor Whitehouse, chairman of the clamping firm concerned, National Clamps, said there are clear signs warning drivers that parking is not allowed.
He said: "There are an abundance of signs in the area categorically saying no stopping at all. No ifs and buts - no stopping is allowed."
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