shaurma in Woodstock

I must say all the "10 stars reviews" you can find about this business are fake and the business itself is fake. Just check the address of his "office". This person must be avoided at all costs. The technician in my case was called to disconnect the AC unit and move it away from the wall in order to do the nessessary repairs to the exterior wall. It is a very easy job for the licenced professional. For $200 he cut the gas pipe and disconnexted the AC. After his visit the furnace stopped working properly and wouldn't heat. I never had a problem with the furnace and AC since i bought them 2 years ago. I contacted this house depot guy again and told him what happened. He was very reluctant to come back to fix the issue, especially when i emphasized that the furnace wouldn't heat after his visit. Nevertheless, I asked him to come and check it. Reluctantly, he agreed to come. When he came I asked him to check everything outside where he was working earlier disconnecting the AC unit. He refused angrily and said it's not the reason the furnace doesn't work. He started disconnecting all the wires on the thermostat then went downstairs and started disconnecting all the wires inside my furnace. While he was doing that he kept complaining that everything was done wrong in my home and the furnace was installed in some illegal way. I told him that the furnace was installed by Direct Energy and ESA came to check everything once it was installed and i never had any problems untill he came earlier to disconnect the AC. He then asked about my nationality and then was mumbleding something about russians (I am Russian). Again, i told him that the problem must be somewhere where he did the job earlier, outside of the house. The furnace always worked fine untill his visit. He got angry and said he's leaving and demanded his pay. I told him there's nothing to pay for. All i had at that moment was the thermostat and the furnace with most wires disconnected, -10 C outside, 11 pm and the technician that was supposed to fix it saying he's leaving. I told him to get out. Next day i called another technician that was recommended by my friend. He connected all the wires back. He asked me: "Why would he disconnect all the wires?? Why dissassemble the thermostat??" He quickly found that the pressure checker was acting up and it didnt let the furnace heat. We went outside and found that the exhaust vent wasn't in a downflow position. As a result the water didn't go down the drain and accumulated inside the pipe. This caused the pressure checker to act up and stop furnace from heating. We positioned the exhaust vent in a downflow position and the furnace works perfectly now as it always did. Well. How the exhaust vent got moved is a mystery and why would the house depot guy even touch it? No one else ever touched it since it was installed. Nevertheless, it was such an easy fix. The visit of the house depot guy (when he came second time) was video recorded. Should i sue him?