At the end of they day they provided you with a service and are completely justified in charging you for it. Granted, the price should have been discussed beforehand, and they should have done it properly with a lockring tool, and the labour charge was steep, but most shops will have a minimum labour charge exactly so they don't get tied up with doing lots of free jobs and can get on with making some money.
I still don't get why people expect bike shops to do jobs for so little money or foc. You wouldn't go into a barbers and expect a little trim gratis would you? Or go into Timpsons and expect them to polish your shoes for free, because it's a two minute job?
At the end of they day they provided you with a service and are completely justified in charging you for it. Granted, the price should have been discussed beforehand, and they should have done it properly with a lockring tool, and the labour charge was steep, but most shops will have a minimum labour charge exactly so they don't get tied up with doing lots of free jobs and can get on with making some money.
I still don't get why people expect bike shops to do jobs for so little money or foc. You wouldn't go into a barbers and expect a little trim gratis would you? Or go into Timpsons and expect them to polish your shoes for free, because it's a two minute job?