Solar Mosaic

We currently have our home for sale and under contract. Our buyers (both husband and wife) were originally denied to assume the solar loan. Mosaic said one thing we/the buyers can do is submit for a manual review to be done to see if they can get approved that way. The manual review was originally requested June 8th and the paperwork was sent in on June 10th. I as the seller was told 7-10 business days, and the buyers were told 7-12 business days. I called in a week later to see if there was an update and was told sorry its not 7-10 days but 7-15 business days. We called in again and was told that we would have an answer on or before June 23rd. June 23rd comes and still no answer so we call and was then told sorry but we didnt get any paperwork from the buyers til June 21st so we need an additional 7-15 business days. We have emails to back up to when the paperwork was sent in. We call in again on Jun 29th for an update and was told once again we will have an answer on or before July 7th. We have requested to speak to the supervisor and every time, the supervisor is unavailable to speak and will call us back and never does. We ask to speak with the supervisors boss and is told the supervisor is now the manager. We dont know what they are trying to pull by refusing to answer but this company is extremely shady and if I would have known that I would never have gotten solar. Save yourself the headache and dont do business with this company.