ACD Gezina , dishonest or uns****ed and poor workmanship

During October 2019 the water bottle light appeared on the dash of my BMW took it to ACD Gezina and was advised that the Water Pump Thermostat and water bottle cap needs to be replaced - R7500.00 after 3 days collected the vehicle with the light still on and comment on invoice "suspect blown head " but was advised to drive the car and monitor - monitor what the car does not have a heat Gage, i refused to drive the car and requested further investigation - ACD then claim that the car was sent to Silverton radiators (Gezina) and the head is blown, R15 000 to R20 000 to repair - absolutely dishonest, poor workmanship and lacks attention to detail.

took back my car sent it to Fastserve (BMW specialist) - confirmed they talking bull the problem was and is the water bottle - replaced it for R1800.00 , car drives perfect now.