ZERO Service

I asked for a service of a 25 year old, 3-panel gas heater and specified a new hose as the original is cracked from old age. After the phone call that it was completed. I arrive to find the cracked hose still in place and original rubber seal still deformed from all the gas cylinders the regulator had been *****ed into over the years. The job card with the words written, "Replace Hose" stuck to the top of the machine. What did the service for R300 then cover?