Best Unclogged Drain in Plano TX

I recently had AC checked with GO Heating and not at all happy with the service . The technician completed his job in less than 10 min and mentioned everything looks good . I don't believe AC can be checked in 10 min. Moreover as soon as technician came he was trying to sell Air Scrubber which I found inappropriate. I don't think technician he knowledgable . Need lot of improvement i would not recommend Go Heating and Air.