Mersey Heating And Air Conditioning

The service was 7/10 the day of the installation. Some minor things went wrong: No reminder call previous evening. 1h late expected time of arrival (no call letting us know) 9.30 am. Probably might be bad communication between office and crew.
Good work on site, above expectations in resolving unexpected problems. A little damage on deck stairs, otherwise really clean afterwards.
Unexpected bad connection with bbq, needed to call back on sunday (tube dislodged, no gas available). We had problems on running a bbq day with family. 24h service came quick to fix it, thanks.
Things got serious when we survived a CO detection of 65 ppm (with open windows) due to malfunction of the hot water tank exhaust after the installation as per the fire department captain. Our dog was at home, but thanks God, we have CO detectors in every floor. Fire department came and we got a red tag from Enbridge. Then our misery started. Since Saturday June 17th, with no hot water in the house, Mersey tried to deny their implication.
Finally, after calling customer service of Costco (Mersey was contracted by Costco for the installation of our Furnace), the manager approached us to fix the problem on Monday June 19th, prosing us that we should pay another extra 1500$ to install a new gas water tank because our tank was not compatible with the new furnace exhaust. After refusing, they agreed to fix the water tank exhaust which was isolated during the furnace installation causing the CO raise in our home. Unfortunately, Tuesday June 20th (4 days with no hot water with a 5 year old at home), they were unable to install the new tank because they were not sure if they would be able to open a second exhaust as required (proposed solutions were impossible to make). That happened after a technician was sent on Monday June 19th (24/7 service did not come/call on sunday as they promised) into our house to inspect the installation that was done on Saturday. Finally today, Wednesday June 21st, they agreed to install, not a gas but an electric tank(Manufact. 2014!!!), which this time (thanks God) they would pay for it, including installation. Thanks Mersey for increasing our hydro bill, much appreciated. The final touch was sublime, please have a look on the attached pictures, the quality of the finish is superb. We were so dissapointed, so angry, so frustated, that the moment they left the house, we felt so relieved that we did not care about them anymore. Please stay far far away from us, do not come back, but people has the right to know what can happen to them if things go South.
P.S: And we can say this is a provisional solution for us but it will be not with your company for sure. Thanks.