Tenants driving me crazy!

[Eddie Seo]

New landlords here.  Renting a single family home to an older couple for the past month and they're already driving us right into the ground. To say they're "high maintenance" would not do it justice.  They call/text us almost every single day with a new request. Most of their requests are minor repair requests.  Things like "hey I just saw an ant, please call pest control immediately."  Or hey our fridge isn't cooling effectively, please get this fixed asap. Then the repair guy finds nothing wrong with it. Or hey our AC isn't cooling as well as it should.  And then we send an AC guy who reports that it's working just fine.  Now it's "our lights are dimming when we try to run a couple appliances in the kitchen. Please call an electrician asap!"  

How would you handle these types of tenants?  And can we start to make them pay for these maintenance requests when the technician finds nothing wrong?  

Thank you