NO Sweat AC and Heating

Service call to replace capacitor on the heat pump system led to one of the refrigerant caps to be installed incorrectly causing leak.
Previously had the evaporator coil replaced by No Sweat AC ($392) on 9/26/18 and the condenser coil replaced by them on 1/18/19 ($963). System was not running properly in March 2019 and I called No Sweat AC to come out and check the problem. On 3/4/2019 they came out and replaced the capacitor and also checked the pressure of the system. Over the next two months the heat pump system cooled less and less. On 5/22/19, called No Sweat AC to come out and check on the problem. They spent 3.5 hours looking over the system and could not find a problem. At the end of the service call the technician showed me that one of the caps might have been causing a leak in the system. He replaced the cap. The system is now working properly, since he replaced the cap. They charged $487.50 and this should have been avoided if they had properly repaired the system in March 2019. I don't trust their work, especially after all the repairs on the system!