Sounds like the people you hired don't know what the heck they are doing. Found this online: There are a few issues that could cause your garage door to misalign such as this. Check the cables on each side of the door and make sure that they are not frayed or damaged. If one of them is frayed then it will cause an uneven pull when opening and closing. The door will gradually shift to the side with the greatest amount of tension.
Another item is the extension pulleys that are located at the top corners of the door. These little round pulleys have small groove like tracts in them that the cables use to lift the door. If these ridges become worn then the cables slip a bit and can shift the door out of alignment.
The only way to correct or repair these issues is to first release the tension on the springs. Then replace any frayed cables or worn pulleys. DO NOT DO THIS ON YOUR OWN! The springs are under a tremendous amount of pressure and can cause serious injury or death. You need to get a trained service technician to come and inspect and fix your door accordingly.
到底啥问题啊，说是30天之内不再收费。但我把人找来又不出问题了咋办。
Found this online:
There are a few issues that could cause your garage door to misalign such as this. Check the cables on each side of the door and make sure that they are not frayed or damaged. If one of them is frayed then it will cause an uneven pull when opening and closing. The door will gradually shift to the side with the greatest amount of tension.
Another item is the extension pulleys that are located at the top corners of the door. These little round pulleys have small groove like tracts in them that the cables use to lift the door. If these ridges become worn then the cables slip a bit and can shift the door out of alignment.
The only way to correct or repair these issues is to first release the tension on the springs. Then replace any frayed cables or worn pulleys. DO NOT DO THIS ON YOUR OWN! The springs are under a tremendous amount of pressure and can cause serious injury or death. You need to get a trained service technician to come and inspect and fix your door accordingly.