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These mobile phone companies are a nightmare to deal with. They are a real pain in the neck 令人討厭的人 /事

Examples
Sam is so disruptive in the class. He’s a pain in the neck to deal with.

Completing this tax form is a real pain in the neck. There are so many boxes to fill in.

The telesales people are a real pain in the neck. They keep ringing me.

http://www.bbc.co.uk/learningenglish/english/features/the-english-we-speak/ep-160503