Duane in Oshawa

Technician was at my home and performed the yearly A\C tune-up that is in our service plan with them. As he was leaving, he explained to me that he was seeing some strange readings while servicing the unit, and would have someone else come back to put the gauges on it to see what it was. I never heard from him after that. No follow up by Limcan. Less than a month later, get a bill for 50% higher gas usage than even my highest previous bill . Notice AC not cycling as it should, running constantly . Call and get technician to come out. He diagnoses that the coil is shot (under warranty) but still charges me a diagnostic fee. Says he doesn't know if one is in stock, and leaves. I call in next morning to see if in stock and about when they may be coming out. Apparently there isn't a record of him checking stock,or arranging follow up repair . (I sense a pattern of behaviour by their techs) I arrange appointment to repair done. Also argue for a refund of the diagnostic fee, which they do . All in all, I paid out 50-70 bucks more in energy charges over the defective coil; and for a month sat through an increasingly warmer environment as the part failed. I sent a letter to the email address the receptionist pointed me too. They have ignored for 3 weeks.