A & M Heating & Cooling

Last year we bought a new HVAC system through A&M heating and cooling within 2 weeks it wasnt working they had to come replace something. Fall came along and its 50 outside and the furnace runs for 3 days straight so we call them they say it is normal for that to happen mind you its 50 outside so what's it going to do at 10 or -30.. it ran most all of the winter without turning off because they said it was normal. June comes along and its 85 outside and the house wont cool down past 77 so we call them they come and say its not working because it has a "dirty" filter. Filter wasn't dirty but changed it anyways just to be sure. The next day same problem so they send someone else out he says there is nothing wrong with it my mom pointed out to him that the air coming out of the first vent on the duct was not even cold. He went outside came back in and said yeah there was a bad part he "replaced" it. Nothing changed now the feels like outside is 100+ outside and its 90 in the house. Cant afford 108$ service call after 108$ service call when nothing is being fixed. Its currently been running for 2 solid days the air coming out of the vent is barely cold at all. My dad worked at A&M when I was a kid so we thought we could trust them knowing my dad always did good work. Seems like they have went down hill since then. I wont use them for anything ever again.