Best Aeroseal Duct Sealing in Chandler AZ

I have left THREE messages for the owner Steve Mason of Mason Mechanical Heating and Air to return my call and no response. Any business owner would most likely return a phone call from a past customer with problems from a repair. Not Steve!! I did have a chance to talk with Nate the service Mgr. and he went round and round how they performed the repairs correctly, however the unit does not work and they don't feel liable after 3 months. They replaced about 90% of the unit with new parts and it does not work! Ask my tenant.