Genesis Heating and Air Conditioning

I Hired Mr *** to install a new A/C unit two months ago
I start using the a/c recently (about 3weeks ago) and now the system does not work properly The thermostat keeps shutting downI replace the new thermostat with guidance of the Honeywell product technician ( Mr *** refused to even come and troubleshoot the system even when it's under warranty - after replacing the new thermostat, the system still doing the same issueThe Honeywell technision told me that it was not the thermostat, he said that most likely had to do with the the power that is not allowing the thermostat connection I explained to *** that this was not a thermostat issue and request for him to come and take a look - he told me that he would have to charge me $for the visit plus the fixing of the problem I told him that the system still under warranty and that he should not charge mehe is refusing to come to troubleshoot the issue and he is refusing to grant the one yr warranty - this