I had a slider pit sheared off in the Caliper of my car brakes   Replacement Calipers were an eye watering £300 each  
 
 
These folks 
https://www.bcs-automotive.co.uk/brake- ... nt/brembo/provided an excellent service, they removed the sheared pin, fitted new pins to both Calipers, serviced and replaced all the seals, finished with a nice gun metal protective coating.  Paid a little under £175 for both calipers refurbished and posted back to me. Oh yes 12 month warranty plus I believe they were pressure tested to ensure they were 100% ok   Wouldn’t hesitate if the Bongo brakes required work.  
I’ve also bought parts from Big Red who are great at cross referencing part numbers. This can save a lot of money too.   
I suspect the mechanic can’t be bothered as replacing seals is not the most pleasant job.
2002 Friendee 2.0 ltr Petrol.