Disgruntled customer

I had a major service - 45000km on the car however it was a 60 000km service. On getting car back, 4 days later the car overheated and there was no water in the tanking feeding the radiator and engine. The car towed into the Port Elizabeth branch - on inspection, the thermostat was leaking and the water pump leaking. Now I ask, how was this not picked up during the service? Why should I be held liable for this mistake? When asked for the to collect me as I live in JBAY, the comment back was there would be financial complications. Please can someone come back to me from head office.