poor workmanship from suzuki gezina

I took my Suzuki SX4 to suzuki gezina for minor repairs . When i received the vehicle back there was some issues witch were not done to my satisfaction and they were very expensive . While my car was there someone phoned me to do some repairs on the windshield and there was no damage to the windshield . When i brought the car in there was no leaks in the aircon . When i received it back there was a leak on the aircon and they quoted me over R7000 to repair . Someone else did it for R940 . This i believe was due to their poor workmanship .