They are terrible ignorant people to deal with that don't know how to properly do their work. They just slap stuff together and don't warranty their work when it fails before it ever works. If you use them it will cost you big money to fix their mistakes and they will do NOTHING to help solve the situation. Save yourself the hassle and the major expense of using them for faulty work and go somewhere that knows what they are doing
Are you the owner of this business?