KMS Air Duct Cleaning

It went fine. They were very professional.

I had used this vendor twice in the past - the first time with great results and the second with middling results.  Both of these times, the tech had verrrrry carefullt covered every register in the house with magnetic sheets to prevent escape of any dust or debris.This third time, it was DISASTROUS!!!  I needed a duct cleaning soon as it every time the A/C came on - I started sneezing and black (at least dark) sooty debris was coming out of the air registers.  The scheduler was responsive when I called; she did get a technician scheduled for the 2nd day after I called -The tech used ONLY forced air with a large vacuum apparatus hooked up to his truck.   BUT.... the technician failed to cover all the registers and when he forced air through the ducting to clean it - it blew large and small chunks of debris and particulates EVERYWHERE in the house!  The walls and furniture were covered in it!I was extremely dissatisfied and called the company to discuss it.  The dispatcher was responsive and sympathetic and said she would send a commercial cleaning crew out to clean up the mess created.BUT THEN - the owner of the company, Ken, called and said he wanted to come look at the house.When Ken arrived, a day later, he looked around and said that because I had experienced some debris blowing before the KMS crew was there, he could not tell whether the debris now settled on everything had been caused by his crew.  He also said that because I had started to clean in the interim, he could not determine what his crew "MAY HAVE CAUSED."  He questioned my veracity (basically called me a liar) and took no responsibility for the mess his crew had caused.  He said he would not schedule a cleaning crew.I asked for a refund and he said he would give me a partial one, but only because I was dissatisfied - as a courtesy.Three days later I received a telephone call from someone in their billing department asking me for my address so he could mail me a $50.00 refund check.   I was "surprised"  they did not have my address - and I was appalled at the puny amount/percentage the owner had authorised.  BUT THERE IS MORE... NO REFUND CHECK EVER ARRIVED!! I called back two weeks later and was told it had been mailed.  It is now almost a year later and still no refund - no call - nothing.KMS was NOT professional at all about their mistakes.DO NOT DO BUSINESS WITH KMS!!
Subsequently my research into air duct cleaning found that forced air alone is the least effective way to clean air ducts.  You get what you pay for - $256 was an inexpensive cost for air duct cleaning a 2400sf home  and I wound up spending double that amount to have the ducts recleaned well (by a different company) and considerable more to have a cleaning drew come in and literally clean the house from ceilings to floors as the white dust and chunks were on every surface as a result of their negligence.