Poor service, lack of feedback

I booked for a Dial a Nerd tech to come to my office and try to help me with a laptop which has slowed down enough to be almost unusable and is necessary in my business. First the tech called me to advise me he couldn't make the appointment I booked (11am) and pushed to come an hour earlier eventhough I was on the road elsewhere. As the matter is urgent and I couldn't wait I advised I'd do my best to get back to suit him. He wasnt there when I arrived but according to my employee had done his checks and left his invoice and a number to call for a detailed breakdown, cos he said there's nothing wrong, The fact that I'm using my wife's laptop for this says otherwise. But I gave him the benefit of the doubt and called the number he gave to get this detailed breakdown, he wasnt in so a message was left for him to get back to me, nothing for 2 days. I then participated in their customer satisfaction survey to let them know their service wasn't great and the next day got a call back from a manager who made excuses for the tech Lee Holt but never got my end of it. She was supposed to call back, but hasnt, still no breakdown. I paid them but will never use them again & tell others.