TERRIBLE!!! film development, prints and enlargeme...

TERRIBLE!!! film development, prints and enlargements. I decided to have my negative developed and scanned at another film lab, and whenever I brought them perfectly exposed images for their enlargement service they changed the density and the prints were a waste of money. The enlargements were either over exposed or underexposed and grainy. I gave them perfectly exposed JPEG files and what you give them is not what they will print. If you complain about it they will blame the exposure on you the photographer or they will make up a COCKA MAMI STORY about the quality of water all of a sudden changing in the San Fernando Valley.

RESPONSE TO OWNERS/MANAGEMENTs RESPONSE:
I have already tried your COLOR image development, prints and enlargement service SEVERAL TIMES over a period of a YEAR. I highly doubt that the water at your San Fernando Lab has anything to do with the DENSITY CHANGES of your print service. IT IS CLEARLY OPERATOR ERROR. Do I have STUPID written on my forehead?