What's Wrong With Your Fridge?

Karl's fridge is broken, and he called out to guy to fix it. Naturally, he's moaning about workmen who come to his house. So why does the guy charge 80 pounds? Secondly, what is karl's main problem with engineers, plumbers, workers who have to come at his house? Thirdly, what advice does the fridge guy give to karl? And fourth what is the problem with karl's new fridge?