That's the one!You talking about seat west London brentford?
Tbh mate if you are I have nothing but praise for them , they fitted a new cylinder head to my Cupra last September and did a first class job , so it doesn't really seem the same place as the op is describing?
I took my car there 3 times regarding a oil leak, which they blamed a previous service for making a mess for the oil...... hold-on, it was you that serviced my car last. Anyway, I found the leak & showed them. Then they forgot to put back a value or something on the rocker cover, so when I got home... engine was covered in oil.... & they overfilled the engine with oil when trying to find the leak
Now it does sound like something they would do! CS was a complete joke!
My money is still on them as it's like a small dodgy back street dealer!