Quality Car Aircon not that good Quality

They are situated inside Car Audio Warehouse, 279 Voortrekker Road Parow. Went to Quintin to have my Jeep's aircon checked as it was not cooling. After "inspection" he "found" a leak on the red outlet valve that was "damaged". He replaced the valve, refilled the system and told me to return a week later so that he can inspect to ensure system is leakproof. Went back a week later, he said that there was now sign of leaking gas. Half an hour later the aircon did not work - no gas in the system. Quintin did not respond to my whatsapp and to date he still ignores my calls and whatsapps. I cannot recommend him to anyone.