Window Nation review: Been waiting 2 months and no one will talk to me

I signed my contract and paid my deposit back on April 23! After 8 weeks of total silence, I began trying to contact them to see when my installation will take place since i was originally told 4-6 weeks...it has been almost 9...
After filing a BBB complaint a sales manager called. He had no explanation as to why my sliding door has not been installed yet. It is just a simple, no-frills door. He offered me $500 off...BUT it will be ANOTHER 3-4 weeks!