Auto aircon repairs in Chumphae recommendations

Hi all. I am out of the country for a few months. The wife told me last night that the aircon in the Mazda has stopped working.

I don't want her to take it to the local 'mechanic'. He is good at some stuff but I don't trust him to do this work competently.

Can anyone help with recommendations for a service in Chumphae that she can take the car to.

I won't take it to Wattana Mazda as we have had terrible service and incompetence from them recently.