Fridge stopped cooling suddenly- compressor works

Well the fridge mechanic came out yesterday and re-gassed the fridge and it worked- for a while! Woke up this morning to the fridge not working and an email bill of £120! Is this an average cost of someone to come out and re-gas? I will ring him again today and tell him it's not working ?
 
Apparently the fridge needs a bit of running time with a hot water bottle on the capillary tube in the freezer compartment to get everything moving because stuff has settled at the bottom due to it being a keel cooler and stood still for a while. Seems to be working again.... so far!
 
Apparently the fridge needs a bit of running time with a hot water bottle on the capillary tube in the freezer compartment to get everything moving because stuff has settled at the bottom due to it being a keel cooler and stood still for a while. Seems to be working again.... so far!
What utter tosh !

Or the system has air contamination within. The moisture in that air then freezes in the capillary tube with the result the fridge stops. I wonder why we not only pressure test but also evacuate to very deep vacuum fridge systems when doing this job properly.
 
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