Divine duct cleaning

We have been contacted with the company for the duct cleaning service and the appointment was very quick. They were on time as agreed. The job was completed so fast which we are not used to since our house is 31000 SQF. After a week we found out that we still face same issue with the dust and the job was not done professionally, so we sent them a message as we used to communicate and there is no response. Also one of their rep called us and when we started to complain, she hang off the phone . We tried calling them several times and left voice messages but there is no response again. We also sent them another message informing that we will post a review on their website and they didn't care for it. Worst Experience Ever